Publications

@article{Trzaskowska2020b,

title = {Generation of a mode in phononic crystal based on 1D/2D structures},

author = {Aleksandra Trzaskowska and P Hakonen and Maciej Wiesner and Sławomir Mielcarek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85083331438&doi=10.1016%2fj.ultras.2020.106146&partnerID=40&md5=c1d6fb94778a467f9b0d741d52e0270a},

doi = {10.1016/j.ultras.2020.106146},

issn = {0041624X},

year  = {2020},

date = {2020-01-01},

journal = {Ultrasonics},

volume = {106},

publisher = {Elsevier B.V.},

abstract = {The modification of phononic crystals by surface structuring allows obtaining a new parameter describing the dynamics of the structure produced in this way. We have investigated the dispersion relation of surface acoustic waves propagating in a phononic material which is based on nanometer-scale surface modulation using interconnected one-dimensional array of stripes and a two-dimensional array of pillars. The influence of these two array components on the dispersion relation has been determined experimentally (Brillouin light scattering) and theoretically (Finite Element Method). The interaction of these two nanostructures supports a new mode which is not observed in independent structures of pillars and stripes. The influence of the relative position of these two nanostructures on the frequency of the new mode has been determined. © 2020 The Author(s)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zdunek2020,

title = {Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]10 multilayers},

author = {Miłosz Zdunek and Aleksandra Trzaskowska and Jarosław W Kłos and Nandan Babu KP and Sławomir Mielcarek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077952443&doi=10.1016%2fj.jmmm.2020.166428&partnerID=40&md5=f094181ffcbfaa509efa95ebe3de9e87},

doi = {10.1016/j.jmmm.2020.166428},

issn = {03048853},

year  = {2020},

date = {2020-01-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {500},

publisher = {Elsevier B.V.},

abstract = {The dispersion relations of surface acoustic waves and spin waves propagating in magnetic [Ni80Fe20/Au/Co/Au]10 multilayers deposited on a silicon substrate have been investigated by high-resolution Brillouin spectroscopy. We measured the spectra of spin waves for two canonical geometries where the spin waves propagate with the wave vector oriented parallel and perpendicular to the direction of static magnetization in-plane magnetized Py layer. We investigated experimentally the crossing of phononic and magnonic dispersion relations and discussed the mechanism of magnetoelastic interaction in this system. © 2020 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Srinivasan2020,

title = {Comments on "Process development and characterization of centrosymmetric semiorganic nonlinear optical crystal: 4-Dimethylaminopyridine potassium chloride"},

author = {B R Srinivasan and A M Petrosyan and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85078001388&doi=10.1016%2fj.physb.2020.411997&partnerID=40&md5=266e2cb17fdb9dfd6fd4afba6ccd9aed},

doi = {10.1016/j.physb.2020.411997},

issn = {09214526},

year  = {2020},

date = {2020-01-01},

journal = {Physica B: Condensed Matter},

volume = {582},

publisher = {Elsevier B.V.},

abstract = {The authors of the title paper [Phys B. Condens. Matter 538 (2018) 199–206) report to have grown 4-dimethylaminopyridine potassium chloride (4-DMAPKC) crystal by slow evaporation solution growth method. In this communication, many points of criticism, concerning the crystal growth, single crystal structure and X-ray powder pattern of this so called 4-DMAPKC crystal are highlighted to prove that the title paper is completely erroneous and the title crystal is potassium chloride. © 2020 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Srinivasan202058,

title = {Comments on the paper "Growth and optical studies of tris (thiourea) potassium barium sulphate crystal: a novel semiorganic NLO bimetallic crystal"},

author = {B R Srinivasan and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077051674&doi=10.1080%2f14328917.2019.1580890&partnerID=40&md5=46d21931f6ac11d7fa9f366041e11bd7},

doi = {10.1080/14328917.2019.1580890},

issn = {14328917},

year  = {2020},

date = {2020-01-01},

journal = {Materials Research Innovations},

volume = {24},

number = {1},

pages = {58-60},

publisher = {Taylor and Francis Ltd.},

abstract = {In a recent paper Azhar et al., (Mater. Res. Innov. https://doi.org/10.1080/14328917.2017.1392694) claim to have grown a tris (thiourea) potassium barium sulphate (TTPBS) crystal, which according to them is a novel NLO bimetallic crystal. In this comment, we prove that the so called TTPBS is a dubious crystal. In addition, we show that the so called barium thiourea chloride (Raju et al Mater. Res. Innov, 2016) thiourea barium chloride (Mahendra et al Optik 2017) and calcium bis(thiourea) chloride (Anis et al Optik 2016) single crystals are all dubious materials and do not contain any alkaline-earth metal but are simply thiourea. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Trzaskowska2020bb,

title = {Surface phonons in topological insulator Bi2Te3 investigated by Brillouin light scattering},

author = {Aleksandra Trzaskowska and Bogusław Mróz},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088375148&doi=10.1038%2fs41598-020-68690-z&partnerID=40&md5=c895186da49c524167338f60a25b7b09},

doi = {10.1038/s41598-020-68690-z},

issn = {20452322},

year  = {2020},

date = {2020-01-01},

journal = {Scientific Reports},

volume = {10},

number = {1},

publisher = {Nature Research},

abstract = {High resolution Brillouin spectroscopy was used for the first time to study the dispersion and anisotropy of surface phonons in the single crystal of topological insulator Bi2Te3. Two surface acoustic waves have been observed, which distinguishes this material from other metals or nontransparent materials. The modes were assigned as Rayleigh waves. The obtained results were then simulated by Finite Element Method. The layered structure of the unit cell proposed in simulation reproduced quite well experimental results of the modes dispersion and anisotropy. © 2020, The Author(s).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{plasmonics2019,

title = {A route to unusually broadband plasmonic absorption spanning from visible to mid-infrared},

author = {M Aalizadeh and A Khavasi and Andriy E Serebryannikov and G A E Vandenbosch and E Ozbay},

url = {https://link.springer.com/article/10.1007/s11468-019-00916-x},

doi = {10.1007/s11468-019-00916-x},

year  = {2019},

date = {2019-01-01},

journal = {Plasmonics},

volume = {14},

pages = {1269–1281},

abstract = {In this paper, a route to ultra-broadband absorption is suggested and demonstrated by a feasible design. The high absorption regime (absorption above 90%) for the suggested structure ranges from visible to mid-infrared (MIR), i.e., for the wavelength varying from 478 to 3278 nm that yields an ultra-wide band with the width of 2800 nm. The structure consists of a top-layerpatterned metal-insulator-metal (MIM) configuration, into the insulator layer of which, an ultra-thin 5 nm layer of manganese (Mn) is embedded. The MIMconfiguration represents a Ti-Al2O3-Ti tri-layer. It is shown that, without the ultra-thin layer of Mn, the absorption bandwidth is reduced to 274 nm. Therefore, adding only a 5 nm layer of Mn leads to a more than tenfold increase in the width of the absorption band. It is explained in detail that the physical mechanism yielding this ultra-broadband result is a combination of plasmonic and non-plasmonic resonance modes, along with the appropriate optical properties of Mn. This structure has the relative bandwidth (RBW) of 149%, while only one step of lithography is required for its fabrication, so it is relatively simple. This makes it rather promising for practical applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{apertures,

title = {Embedded arrays of annular apertures with multiband near-zero-index behavior and demultiplexing capability at near-infrared},

author = {Andriy E Serebryannikov and H Hajian and Maciej Krawczyk and G A E Vandenbosch and E Ozbay},

url = {https://doi.org/10.1364/OME.9.003169},

doi = {10.1364/OME.9.003169},

year  = {2019},

date = {2019-01-01},

journal = {Optical Materials Express},

volume = {9},

pages = {3169},

abstract = {In this paper, we study transmission through the embedded arrays of subwavelength annular apertures at near-infrared. Single, i.e. non-embedded arrays of annular holes are known for their capability for high-efficiency transmission even through rather thick apertures in a wide frequency range, extending from microwaves to the visible. In the suggested structures, which contain up to four embedded arrays, multiband operation can be obtained, so that each array is mainly responsible for one of four transmission bands. In such a way, a demultiplexing-like functionality can be realized, i.e. the desired parts of the incident-wave spectrum are distributed between several transmission channels. In the studied structures, we obtain (nearly) zero phase advancement and that indicates near-zero-index behavior at the expected propagation thresholds of plasmonic modes in the frequency domain. Therefore, the earlier developed concept of supercoupling and squeezing into very narrow waveguide channels is applicable to the studied structures. The number of near-zero-index bands is determined by the number of the embedded arrays. The effects of thickness, width of the slits, and permittivity of the filling material are numerically studied and discussed in detail. It is shown that multiband transmission may exist in the near-zero-index regime in a very wide range of parameter variations.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{exchange2019,

title = {Exchange spin waves transmission through the interface between two antiferromagnetically coupled ferromagnetic media},

author = {M Mailian and O Y Gorobets and Y I Gorobets and Mateusz Zelent and Maciej Krawczyk},

url = {https://www.sciencedirect.com/science/article/pii/S0304885318336825?via%3Dihub},

doi = {10.1016/j.jmmm.2019.02.062},

year  = {2019},

date = {2019-01-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {484},

pages = {484},

abstract = {With increasing demand for miniaturization in computational and communication technologies, the ability to control spin wave amplitude and phase attract considerable attention, due to prospect of magnonics for valuable decrease of consumed energy with increased functionality of devices. In our paper we theoretically investigate spin wave propagation in the system of two antiferromagnetically coupled magnetic media separated with an ultrathin nonmagnetic interface layer. We propose to use this specially designed interface to perform control over the phase and the intensity of the transmitted spin waves. Our results show, that the interface with varying exchange coupling parameter can be treated as a metasurface, which can offer a change of the spin wave phase between transmitted and incident waves in the range from pi/2 to pi/2. In particular we show, that a positive shift correlates with the lower and the negative phase shift with higher transmittance. Moreover, we show that the phase shift can be controlled by the external magnetic field.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{skyrmion_3,

title = {Formation of Néel-type skyrmions in an antidot lattice with perpendicular magnetic anisotropy},

author = {S Saha and Mateusz Zelent and S Finizio and Michał Mruczkiewicz and S Tacchi and A K Suszka and S Wintz and N S Bingham and J Raabe and Maciej Krawczyk and L J Heydermann},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.144435},

doi = {10.1103/PhysRevB.100.144435},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review B},

volume = {100},

pages = {144435},

abstract = {Magnetic skyrmions are particlelike chiral spin textures found in magnetic films with out-of-plane anisotropy and are considered to be potential candidates as information carriers in next generation data storage devices. Despite intense research into the nature of skyrmions and their dynamic properties, there are several key challenges that still need to be addressed. In particular, the outstanding issues are the reproducible generation, stabilization, and confinement of skyrmions at room temperature. Here, we present a method for the capture of magnetic skyrmions in an array of defects in the form of an antidot lattice. We find that inhomogeneity in the total effective field produced by the antidot lattice is important for the formation of skyrmions which are mainly stabilized by the dipolar interaction. With micromagnetic simulations and scanning transmission x-ray microscopy we elucidate that the formation of skyrmions within the antidot lattice depends on the lattice constant and that, below a certain lattice constant, the skyrmion formation is suppressed. Based on our results we propose that, by varying the lattice constant, we can modify the probability of skyrmion formation in different parts of a sample by specific patterning. This provides another platform for experimental investigations of skyrmions and skyrmion-based devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{doaminwalls,

title = {Inelastic spin‐wave scattering by Bloch domain wall flexure oscillations},

author = {N N Dadoenkova and Yu S Dadoenkova and I L Lyubchanskii and Maciej Krawczyk and K Y Guslienko},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/pssr.201800589?af=R},

doi = {10.1002/pssr.201800589},

year  = {2019},

date = {2019-01-01},

journal = {Physica Status Solidi - RRL},

volume = {2019},

pages = {1800589},

abstract = {The calculations of the inelastic spin wave scattering by flexure vibrations of the Bloch domain wall (Winter’s magnons) in thin magnetic films are 

presented. The approach is based on the interaction of the propagating spin waves with the dynamical emergent electromagnetic field generated by the 

moving inhomogeneous magnetization texture (domain wall). The probability of the spin wave scattering for the Winter’s magnon emission and absorption 

processes essentially rises with the spin wave scattering angle increase up to 90 deg. The angular dependence of the scattering probability is essentially 

stronger for the magnon absorption processes that allow distinguishing these elementary emission/absorption processes experimentally.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{dipolar,

title = {Influence of nonmagnetic dielectric spacers on the spin-wave response of one-dimensional planar magnonic crystals},

author = {Grzegorz Centała and Mykhaylo Sokolovskyy and C S Davies and Michał Mruczkiewicz and Sławomir Mamica and Justyna Rychły and Jarosław W Kłos and V V Kruglyak and Maciej Krawczyk},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.224428},

doi = {10.1103/PhysRevB.100.224428},

year  = {2019},

date = {2019-01-01},

urldate = {2019-01-01},

journal = {Physical Review B},

volume = {100},

pages = {224428},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{meta2019,

title = {Light guiding, bending, and splitting via local modification of interfaces of a photonic waveguide},

author = {Vishal Vashistha and Maciej Krawczyk and Andriy E Serebryannikov and G A E Vandenbosch},

url = {https://doi.org/10.1364/OL.44.004725},

doi = {10.1364/OL.44.004725},

year  = {2019},

date = {2019-01-01},

journal = {Optics Letters},

volume = {44},

pages = {4725},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{quasi3,

title = {Magnons in a quasicrystal: propagation, extinction, and localization of spin waves in Fibonacci structures},

author = {F Lisiecki and Justyna Rychły and P Kuświk and H Glowinski and Jarosław W Kłos and F Gross and N Tager and I Bykova and M Wiegand and Mateusz Zelent and E Goering and G Schutz and Maciej Krawczyk and F Stobiecki and Janusz Dubowik and J Gräfe},

url = {https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.054061},

doi = {10.1103/PhysRevApplied.11.054061},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review Applied},

volume = {11},

pages = {054061},

abstract = {Magnonic quasicrystals exceed the possibilities of spin-wave (SW) manipulation offered by regular magnonic crystals, because of their more complex SW spectra with fractal characteristics. Here, we report the direct x-ray microscopic observation of propagating SWs in a magnonic quasicrystal, consisting of dipolar coupled permalloy nanowires arranged in a one-dimensional Fibonacci sequence. SWs from the first and second band as well as evanescent waves from the band gap between them are imaged. Moreover,additional mini band gaps in the spectrum are demonstrated, directly indicating an influence of 

the quasiperiodicity of the system. Finally, the localization of SW modes within the Fibonacci crystal is shown. The experimental results are interpreted using numerical calculations and we deduce a simple model to estimate the frequency position of the magnonic gaps in quasiperiodic structures. The demonstrated features of SW spectra in one-dimensional magnonic quasicrystals allow utilizing this class of metamaterials for magnonics and make them an ideal basis for future applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{SM_2019_1,

title = {Non-uniform spin wave softening in 2D magnonic crystals as a tool for opening omnidirectional magnonic band gaps},

author = {Sławomir Mamica and Maciej Krawczyk and D Grundler},

url = {https://arxiv.org/abs/1810.04005},

doi = {10.1103/PhysRevApplied.11.054011},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review Applied},

volume = {11},

number = {5},

pages = {054011},

abstract = {By means of the plane-wave method we study spin-wave dynamics in two-dimensional bicomponent magnonic crystals based on a squeezed hexagonal lattice and consist of a permalloy thin film with cobalt inclusions. We explore the dependence of a spin-wave frequency on the external magnetic field, especially in weak fields where the mode softening takes place. For considered structures, the mode softening proves to be highly nonuniform on both the mode number and the wave vector. We find this effect to be responsible for the omnidirectional band gap opening. Moreover, we show that the enhancement of the demagnetizing field caused by the squeezing of the structure is of crucial importance for the nonuniform mode softening. This allows us to employ this mechanism to design magnonic gaps with different sensitivity for the tiny change of the external field. The effects we find should be useful in designing and optimization of spin-wave filters highly tunable by an external magnetic field.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{quasicryst,

title = {Remagnetization in arrays of ferromagnetic nanostripes with periodic and quasiperiodic order},

author = {Krzysztof Szulc and F Lisiecki and A Makarov and Mateusz Zelent and P Kuświk and H Głowiński and Jarosław W Kłos and M Munzenberg and R Gieniusz and Janusz Dubowik and F Stobiecki and Maciej Krawczyk},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.064412},

doi = {10.1103/PhysRevB.99.064412},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review B},

volume = {99},

pages = {064412},

abstract = {We investigate experimentally and theoretically the magnetization reversal process in one-dimensional magnonic structures composed of permalloy nanostripes of the two different widths and finite length arranged in a periodic and quasiperiodic order. We showed that dipolar coupling between rectangular nanostripes is significantly reduced as compared to the analytical and numerical predictions, probably due to formation of the closure domains at the nanostripe ends. Although the main feature of the hysteresis loop is determined by different shape anisotropies of the component elements and the dipolar interactions between them, the quasiperiodic order influences the hysteresis loop by introducing additional tiny switching steps and change of the plateau width. We also showed that the dipolar interactions between nanostripes forming a ribbon can be counterintuitively decreased by reduction of the distance between the neighboring ribbons.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{qyasicrystals12019,

title = {Reprogrammability and scalability of magnonic fibonacci quasicrystals},

author = {F Lisiecki and Justyna Rychły and P Kuświk and H Głowiński and Jarosław W Kłos and F Gross and I Bykova and M Weigand and Mateusz Zelent and E J Goering and G Schutz and G Gubbiotti and Maciej Krawczyk and F Stobiecki and Janusz Dubowik and J Gräfe},

url = {https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.054003},

doi = {10.1103/PhysRevApplied.11.054003},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review Applied},

volume = {11},

pages = {054003},

abstract = {Magnonic crystals are systems that can be used to design and tune the dynamic properties of magnetization. Here, we focus on one-dimensional Fibonacci magnonic quasicrystals. We confirm the existence of collective spin waves propagating through the structure as well as dispersionless modes; the reprogammability of the resonance frequencies, dependent on the magnetization order; and dynamic spin-wave interactions. With the fundamental understanding of these properties, we lay a foundation for the scalable and advanced design of spin-wave band structures for spintronic, microwave, and magnonic applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{squeezing,

title = {Reversible tuning of omnidirectional band gaps in two-dimensional magnonic crystals by magnetic field and in-plane squeezing},

author = {Sławomir Mamica and Maciej Krawczyk},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.214410},

doi = {10.1103/PhysRevB.100.214410},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review B},

volume = {100},

pages = {214410},

abstract = {By means of the plane-wave method, we study nonuniform, i.e., mode- and k-dependent, effects in the spinwave spectrum of a two-dimensional bicomponent magnonic crystal. We use the crystal based on a hexagonal lattice squeezed in the direction of the external magnetic field wherein the squeezing applies to the lattice and the shape of inclusions. The squeezing changes both the demagnetizing field and the spatial confinement of the excitation, which may lead to the occurrence of an omnidirectional magnonic band gap. In particular, we study the role played by propagational effects, which allows us to explain the k-dependent softening of modes. The effects we found enabled us not only to design the width and position of magnonic band gaps, but also to plan their response to a change in the external magnetic field magnitude. This allows the reversible tuning of magnonic band gaps, and it shows that the studied structures are promising candidates for designing magnonic devices that are tunable during operation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{memristors,

title = {Rozwiązania techniczne i zasady funkcjonowania memrystorów},

author = {Jarosław W Kłos and K Badnarek and L Kasprzyk and Szymon Mieszczak},

url = {http://pe.org.pl/articles/2019/1/15.pdf},

doi = {10.15199/48.2019.01.15},

year  = {2019},

date = {2019-01-01},

journal = {Przegląd Elektrotechniczny},

volume = {95},

number = {1},

pages = {57},

abstract = {W pracy omówiono memrystory – nowe elementy obwodów elektrycznych, których stosowanie może znacząco przyczynić się do rozwoju technologii informacyjnych. Opisano własności funkcjonalne memrystorów ferroelektrycznych ze złączem tunelowym oraz memrystorów z dwutlenku tytanu z mobilnymi wakansami tlenowymi. Przedstawiono również symulacje pracy memrystorów oraz możliwości ich zastosowań.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{metalens2,

title = {Spin wave collimation using a flat metasurface},

author = {Mateusz Zelent and M Mailian and Vishal Vashistha and Paweł Gruszecki and O Y Gorobets and Y I Gorobets and Maciej Krawczyk},

url = {https://pubs.rsc.org/en/content/articlelanding/2019/nr/c8nr10484k#!divAbstract},

doi = {10.1039/c8nr10484k},

year  = {2019},

date = {2019-01-01},

journal = {Nanoscale},

volume = {11},

pages = {9743},

abstract = {In this paper, we show that the phase shift of spin waves propagating in the plane of the film can be controlled by a metasurface formed by an ultra-narrow non-magnetic spacer separating edges of the two thin ferromagnetic films. For this purpose, we exploit the strength of the exchange coupling of the RKKY type between the films which allows tuning the phase of the transmitted spin waves in the wide range of angles [−π/2; π/2]. We combined the phase-shift dependency along the interface with the lens equation to demonstrate numerically the metalens for spin waves.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{magnonic_cylinder,

title = {Spin wave modes in a cylindrical nanowire in crossover dipolarexchange regime},

author = {Justyna Rychły and V S Tkachenko and Jarosław W Kłos and A Kuchko and Maciej Krawczyk},

url = {https://doi.org/10.1088/1361-6463/aaf2fc},

doi = {10.1088/1361-6463/aaf2fc},

year  = {2019},

date = {2019-01-01},

journal = {Journal of Physics D: Applied Physics},

volume = {52},

pages = {075003},

abstract = {Nanoscale magnetic systems have been studied extensively in various geometries, such as wires of different cross-sections, arrays of wires, dots, rings, etc. Such systems have interesting physical properties and promising applications in advanced magnetic devices. Uniform magnetic nanowires are the basic structures which were broadly investigated. However, some of their dynamical properties, like: (anti)crossing between the spin wave modes and impact of the magnetic field on the spin wave spectrum, still need to be exploited. We continue this research by investigation of the spin wave dynamics in solid Ni nanowire of the circular cross-section. We use two approaches: semi-analytical calculations and numerical computations based on the finite element method. We solve coupled Landau–Lifshitz and Maxwell equations and consider both dipolar and exchange interactions. We identify the dispersion brunches and their (anti)crossing by plotting the spatial profiles of spin wave amplitudes and magnetostatic potential. We also check how we can tune the spectrum of the modes by application of the external magnetic field and how it affects the modes and their dominating type of interaction. 

 

J Rychły1,2 , V S Tkachenko3, J W Kłos1,4 , A Kuchko5,6 

and M Krawczyk1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{spintronics1,

title = {Spin-polarized currents driven by spin-dependent surface screening},

author = {Piotr Graczyk and Maciej Krawczyk},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.195415},

doi = {10.1103/PhysRevB.100.195415},

year  = {2019},

date = {2019-01-01},

journal = {Physical Review B},

volume = {100},

pages = {195415},

abstract = {We demonstrate the mechanism of spin current generation in ultrathin ferromagnetic film by voltage-induced interface magnetoelectric effect and provide a rigorous theoretical and numerical description of the phenomenon. Surprisingly, for MgO-Cu-Co-MgO systems the spin-dependent screening in thin (less than 20 nm) Co film produces spin accumulation 7 times higher than the accumulation induced by the bulk effect of spin-dependent conductivity in thick Co films. An experimental approach to validate our numerical predictions is proposed. The demonstrated effect opens routes to design highly miniaturized, voltage-controlled spintronic or magnonic devices, while the developed model is a useful tool to study spin currents driven by surface screening.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{phase3,

title = {Spin-wave phase inverter upon a single nanodefect},

author = {O V Dobrovolskiy and R Sachser and S A Bunyaev and D Navas and V M Bevz and Mateusz Zelent and Wojciech Śmigaj and Justyna Rychły and Maciej Krawczyk and M Huth and R V Vovk and G N Kakazei},

url = {https://pubs.acs.org/doi/10.1021/acsami.9b02717},

doi = {10.1021/acsami.9b02717},

year  = {2019},

date = {2019-01-01},

urldate = {2019-01-01},

journal = {ACS Applied Materials and Interfaces},

volume = {11},

pages = {17654},

abstract = {Local modification of magnetic properties of nanoelements is a key to design future-generation magnonic devices in which information is carried and processed via spin waves. One of the biggest challenges here is to fabricate simple and miniature phase-controlling elements with broad tunability. Here, we successfully realize such spin-wave phase shifters upon a single nanogroove milled 

by a focused ion beam in a Co−Fe microsized magnonic waveguide. By varying the groove depth and the in-plane bias magnetic field, we continuously tune the spin-wave phase and experimentally evidence a complete phase inversion. The microscopic mechanism of the phase shift is based on the combined action of the nanogroove as a geometrical defect and the lower spin-wave group velocity in the 

waveguide under the groove where the magnetization is reduced due to the incorporation of Ga ions during the ion-beam milling. The proposed phase shifter can easily be on-chip integrated with spin-wave logic gates and other magnonic devices. Our findings are crucial for designing nanomagnonic circuits and for the development of spin-wave nano-optics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{triangle,

title = {Standing spin waves in perpendicularly magnetized triangular dots},

author = {Julia Kharlan and P Bondarenko and Maciej Krawczyk and O Salyuk and Elena Tartakovskaya and Aleksandra Trzaskowska and V Golub},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.184416},

doi = {10.1103/PhysRevB.100.184416},

year  = {2019},

date = {2019-01-01},

urldate = {2019-01-01},

journal = {Physical Review B},

volume = {100},

pages = {184416},

abstract = {Standing spin waves in triangular dots (truncated pyramids) were investigated both experimentally and theoretically. Arrays of nickel triangular pyramids with the base side of 270 nm and height of 70 nm were deposited on Si (111) substrate. The spectra of ferromagnetic resonance were obtained at room temperature with an external saturating magnetic field directed perpendicular to the array plane. The theoretical approach, which allows to describe standing spin wave modes both in perpendicular magnetized regular prisms and in close to prisms truncated pyramids, was developed. Theoretically calculated resonance fields for the observed modes are in a good correlation with the experiment.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{domains1,

title = {The influence of the internal domain wall structure on spin wave band structure in periodic magnetic stripe domain patterns},

author = {Paweł Gruszecki and C Banerjee and Michał Mruczkiewicz and O Hellwig and A Barman and Maciej Krawczyk},

url = {https://www.sciencedirect.com/science/article/pii/S0081194719300037?via%3Dihub},

doi = {10.1016/bs.ssp.2019.09.003},

year  = {2019},

date = {2019-01-01},

journal = {Solid State Physics},

volume = {70},

pages = {79},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{graphenhBN,

title = {Tunable infrared asymmetric light transmission and absorption via graphene hBN metamaterials},

author = {H Hajian and A Ghobadi and Andriy E Serebryannikov and B Butun and G A E Vandenbosch and E Ozbay},

url = {https://doi.org/10.1063/1.5118887},

doi = {10.1063/1.5118887},

year  = {2019},

date = {2019-01-01},

journal = {Journal of Applied Physics},

volume = {126},

pages = {193102},

abstract = {We theoretically prove in this paper that using planar multilayer graphene-hexagonal boron nitride (hBN) metamaterials (GhMMs) can yield ultrabroadband and high-contrast asymmetric transmission (AT) and asymmetric absorption (AA) of light. The AA and AT features are obtained in the far-infrared (FIR) and mid-infrared (MIR) regions for normally incident light with transverse magnetic polarization. 

Here, the GhMMs are integrated with two asymmetric gratings of Ge and are composed of alternating multilayers of graphene (11 multilayers) and hBN layers (10 layers). Moreover, the total subwavelength thickness of the hybrid structures is about 3 μm, being less than half of the free-space wavelength up to nearly 50 THz. This approach—which is similar to the one introduced by Xu and Lezec [Nat. 

Commun. 5, 4141 (2014)] for a passive hyperbolic metamaterial operating in the visible range—is based on the excitation of high-β modes of the GhMM with different transmission characteristics. In addition to being ultrabroadband and high-contrast, AT and AA features of the proposed GhMMs can be actively tuned by varying the chemical potential of graphene. Furthermore, it is shown that an onoff 

switching of AT factor at FIR and selective tunability at MIR frequencies can be obtained via varying μ. Due to its subwavelength and planar configuration and active operation, these multilayer graphene-hBN metamaterials with AT and AA characteristics hold promise for integration with compact optical systems operating in the MIR and FIR ranges and are suitable for applications such as optical diodes, 

sensors, and thermal emitters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{MAXYMUS,

title = {Visualizing nanoscale spin waves using MAXYMUS},

author = {J Gräfe and M Weigand and B Van Waeyenberge and A Gangwar and F Gross and F Lisiecki and Justyna Rychły and H Stoll and N Trager and J Forster and F Stobiecki and Janusz Dubowik and Jarosław W Kłos and Maciej Krawczyk and C H Back and E J Goering and G Schutz},

url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11090/1109025/Visualizing-nanoscale-spin-waves-using-MAXYMUS/10.1117/12.2530326.short},

doi = {10.1117/12.2530326},

year  = {2019},

date = {2019-01-01},

journal = {Proceedings Volume 11090, Spintronics XII},

volume = {XII},

pages = {1109025},

abstract = {Magnonics research, i.e. the manipulation of spin waves for information processing, is a topic of intense research interest in the past years. FMR, BLS and MOKE measurements lead to tremendous success and advancement of the eld. However, these methods are limited in their spatial resolution. X-ray microscopy opens up a way to push to spatial resolutions below 100 nm. Here, we discuss the methodology of STXM for pump-probe data acquisition with single photon counting and arbitrary excitation patterns. Furthermore, we showcase these capabilities using two magnonic crystals as examples: an antidot lattice and a Fibonacci quasicrystal.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{graphen2,

title = {VO2-hBN-graphene-based bi-functional metamaterial for mid-infrared bi-tunable asymmetric transmission and nearly perfect resonant absorption},

author = {H Hajian and A Ghobadi and Andriy E Serebryannikov and B Butun and G A E Vandenbosch and E Ozbay},

url = {https://www.osapublishing.org/josab/abstract.cfm?uri=josab-36-6-1607},

doi = {10.1364/JOSAB.36.001607},

year  = {2019},

date = {2019-01-01},

journal = {Journal of the Optical Society of America B},

volume = {36},

pages = {1607},

abstract = {Bi-tunable asymmetric light transmission (AT) and nearly perfect resonant absorption functionalities are achieved by a Lorentz-reciprocal metamaterial for the operation at the mid-infrared (MIR) wavelengths and transverse magnetic polarization. The bi-tunable metamaterial with bi-functional features and a total thickness of 1.8 μm is based on an hBN/graphene/hBN heterostructure that is bounded by a Ge grating on the upper side and a hybrid VO2∕Au grating on the lower side. Through analytical calculations, we first investigate how the dispersion characteristics of the high-β hyperbolic phonon polaritons of hBN can be controlled and hybridized through the insulator (i-VO2) to metal (m-VO2) transition of VO2 in a bare hBN∕VO2 heterostructure. Then, at the absence of graphene and owing to the support of the hybridized high-β modes, a broad and efficient AT with forwardto- backward contrast exceeding 40% is obtained by numerical calculations for the i-VO2 case, as the first functionality of the structure. Moreover, it is found that for the m-VO2 case, the device is no longer transmittive and a nearly perfect resonant absorption response, as the second functionality, is observed for backward illumination. Finally, by introducing multilayer graphene into the structure and considering the intermediate states of VO2 in the calculations, the bi-tunable transmission and absorption characteristics of the device are investigated. We believe the designed metamaterial is well-suited for MIR optical diodes, sensors, and thermal emitters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Miłosz20191156,

title = {Scanning tunneling microscopy study of Cu-induced surface restructuring of Si(100)-(2×1)},

author = {Zygmunt Miłosz and P Wojciechowski and I Zgrajek and M Wróblewska-Marciniak and Sławomir Mielcarek and F Stobiecki and M Lewandowski},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063323239&doi=10.1016%2fj.apsusc.2019.03.008&partnerID=40&md5=3750bb64647cc522e6637a2c93973af2},

doi = {10.1016/j.apsusc.2019.03.008},

issn = {01694332},

year  = {2019},

date = {2019-01-01},

journal = {Applied Surface Science},

volume = {480},

pages = {1156-1161},

publisher = {Elsevier B.V.},

abstract = {We used scanning tunneling microscopy (STM) to study the Cu-induced restructuring of Si(100)-(2 × 1) surface at the atomic scale. Copper was deposited onto silicon substrates kept at room temperature (RT) or 500 °C. Submonolayer amounts of Cu were found to be sufficient to induce a visible restructuring of the Si(100)-(2 × 1) surface manifested by the disappearance of the vacancy line defects (VLDs), as well as dimer rows disordering (for the RT deposition) or the formation of a c(4 × 4) surface reconstruction (for the 500 °C deposition) not reported for the Cu/Si(100) system so far. Higher amounts of Cu deposited onto the RT-disordered surface at 500 °C led to the formation of 3D CuSi crystallites, accompanied by a significant surface roughening. In contrast, deposition of large amounts of Cu onto a pristine Si(100) at 500 °C resulted in the formation of a near-(1 × 1) local surface atoms ordering. © 2019 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Babu2019,

title = {Interaction between thermal magnons and phonons in a CoFeB/Au multilayer},

author = {Nandan Babu KP and Aleksandra Trzaskowska and Sławomir Mielcarek and H Głowiński and O M Chumak and Miłosz Zdunek and Jarosław W Kłos and Maciej Krawczyk},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077783299&doi=10.1109%2fLMAG.2019.2950304&partnerID=40&md5=8c693c9270354b6acc01e68096fd39a3},

doi = {10.1109/LMAG.2019.2950304},

issn = {1949307X},

year  = {2019},

date = {2019-01-01},

journal = {IEEE Magnetics Letters},

volume = {10},

pages = {4508205},

publisher = {Institute of Electrical and Electronics Engineers Inc.},

abstract = {The dispersion relations of thermal magnons and phonons, which exist in a multilayered CoFeB/Au sample deposited on a silicon substrate, were determined by using Brillouin light scattering spectrometry in the oblique geometry, for the 45° angle between the in-plane-oriented static magnetization and the wave vector. Due to the low effective saturation magnetization of the multilayer, we were able to measure the crossing between the dispersion branches for spin waves and surface acoustic waves with the signature of the magnetoelastic interactions in the form of a coalescence of dispersion branches. The oblique geometry was chosen to enhance the interaction between both kinds of waves. © 2010-2012 IEEE.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tylczyński2019,

title = {Erratum to: A collection of 505 papers on false or unconfirmed ferroelectric properties in single crystals, ceramics and polymers (Frontiers of Physics, (2019), 14, 6, (63301), 10.1007/s11467-019-0912-5)},

author = {Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071443016&doi=10.1007%2fs11467-019-0925-0&partnerID=40&md5=ab6a84896b783e5057e584ce68457e28},

doi = {10.1007/s11467-019-0925-0},

issn = {20950462},

year  = {2019},

date = {2019-01-01},

journal = {Frontiers of Physics},

volume = {14},

number = {6},

pages = {63304},

publisher = {Higher Education Press},

abstract = {In the original publication of the article, there are some mistakes regarding the sequence of references. Some references are mislocated. Here is the new version of the full paper. © 2019, Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tylczyński2019b,

title = {A collection of 505 papers on false or unconfirmed ferroelectric properties in single crystals, ceramics and polymers},

author = {Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068137696&doi=10.1007%2fs11467-019-0912-5&partnerID=40&md5=e108d525a23e6f52441a151c075bcbf6},

doi = {10.1007/s11467-019-0912-5},

issn = {20950462},

year  = {2019},

date = {2019-01-01},

journal = {Frontiers of Physics},

volume = {14},

number = {6},

publisher = {Higher Education Press},

abstract = {This collection presents 505 papers on ferroelectricity in single crystals, ceramics and polymers in which pointed or elliptical hysteresis loops would testify to their ferroelectric properties. In some papers, the authors ensure that ferroelectricity can occur even in materials that do not have a polar axis of symmetry. © 2019, Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Narvekar2019349,

title = {Iron doping in sodium para-nitrophenolate dihydrate crystal: A case study},

author = {K U Narvekar and V S Nadkarni and Zbigniew Tylczyński and B R Srinivasan},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063080460&doi=10.1016%2fj.mtcomm.2019.03.002&partnerID=40&md5=48ded74d17cab152dca30340913008ea},

doi = {10.1016/j.mtcomm.2019.03.002},

issn = {23524928},

year  = {2019},

date = {2019-01-01},

journal = {Materials Today Communications},

volume = {19},

pages = {349-351},

publisher = {Elsevier Ltd},

abstract = {In this study we examine a case of iron doping in sodium para-nitrophenolate dihydrate single crystal recently reported by Dalal and Kumar (Mater. Lett. 165 (2016) 99–102). We show that, addition of ferric (Fe 3+ ) ions into an aqueous solution of sodium para-nitrophenolate dihydrate (1) results in immediate precipitation of an insoluble brown hydrous iron(III) oxide, which precludes any doping (incorporation) of iron in (1). The crystals grown after filtering the precipitate show a negative spot test for iron and exhibit sharp proton resonances in the 1 H NMR spectrum proving no incorporation of iron in (1). In addition to highlighting the importance of the reactive chemistry of the dopant and the host for crystal growth from solution, we show that ferric ions cannot be doped into a host material whose aqueous solution is alkaline. © 2019 Elsevier Ltd},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wiesner2019,

title = {The effect of substrate and surface plasmons on symmetry breaking at the substrate interface of the topological insulator Bi2Te3},

author = {Maciej Wiesner and R H Roberts and J-F Lin and D Akinwande and T Hesjedal and L B Duffy and S Wang and Y Song and J Jenczyk and S Jurga and Bogusław Mróz},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85064570381&doi=10.1038%2fs41598-019-42598-9&partnerID=40&md5=a6d36b2cf5d407ea3d8fbd9a9c5c8587},

doi = {10.1038/s41598-019-42598-9},

issn = {20452322},

year  = {2019},

date = {2019-01-01},

journal = {Scientific Reports},

volume = {9},

number = {1},

pages = {6147},

publisher = {Nature Publishing Group},

abstract = {A pressing challenge in engineering devices with topological insulators (TIs) is that electron transport is dominated by the bulk conductance, and so dissipationless surface states account for only a small fraction of the conductance. Enhancing the surface-to-volume ratio is a common method to enhance the relative contribution of such states. In thin films with reduced thickness, the confinement results in symmetry-breaking and is critical for the experimental observation of topologically protected surface states. We employ micro-Raman and tip-enhanced Raman spectroscopy to examine three different mechanisms of symmetry breaking in Bi 2 Te 3 TI thin films: surface plasmon generation, charge transfer, and application of a periodic strain potential. These mechanisms are facilitated by semiconducting and insulating substrates that modify the electronic and mechanical conditions at the sample surface and alter the long-range interactions between Bi 2 Te 3 and the substrate. We confirm the symmetry breaking in Bi 2 Te 3 via the emergence of the Raman-forbidden A1u2 mode. Our results suggest that topological surface states can exist at the Bi 2 Te 3 /substrate interface, which is in a good agreement with previous theoretical results predicting the tunability of the vertical location of helical surface states in TI/substrate heterostructures. © 2019, The Author(s).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Szwengiel2019237,

title = {Effect of metal ions on levan synthesis efficiency and its parameters by levansucrase from Bacillus subtilis},

author = {A Szwengiel and Maciej Wiesner},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060551705&doi=10.1016%2fj.ijbiomac.2019.01.155&partnerID=40&md5=27eb11f98888d4620c2f957299686b10},

doi = {10.1016/j.ijbiomac.2019.01.155},

issn = {01418130},

year  = {2019},

date = {2019-01-01},

journal = {International Journal of Biological Macromolecules},

volume = {128},

pages = {237-243},

publisher = {Elsevier B.V.},

abstract = {Levan is a fructan whose backbone is composed of β-(2-6) linkages. It is synthetized by the enzyme levansucrase (EC 2.4.1.10). The effect of Fe 3+ , K + , Mg 2+ , Mn 2+ , and Zn 2+ in the range of 0–1 mM on parameters of levan was tested using design of response surface experiment. The bimodal distribution of levan was observed, however, the concentration of high molecular mass fraction (weight average molar mass, M w = 1.9 · 10 7 ± 3.4 · 10 4 g/mol and intrinsic viscosity, [η] = 0.206 ± 0.016 dL/g,) was not >4% of the total yield of levan. The metal ions in the reaction medium had an effect on parameters of low molecular mass levan and the efficiency of synthesis. Molar mass distribution of abundant, low molecular mass fraction was in the range of 4.33 · 10 4 g/mol to 9.77 · 10 4 g/mol; [η] was 0.040–0.075 dL/g while the efficiency of transfructosylation was within the range of 61.4to 69.1%. It was observed that the molar mass of levan depends on Fe 3+ concentration while intrinsic viscosity is affected by the concentration of Mn 2+ in the reaction medium. The GPC (with triple detection) data was analyzed using response surface methodology (RSM), k-means and principal component analysis (PCA). © 2019 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{syrmions_exitations,

title = {Azimuthal spin-wave excitations in magnetic nanodots over the soliton background: Vortex, Bloch, and Néel-like skyrmions},

author = {Michał Mruczkiewicz and Paweł Gruszecki and Maciej Krawczyk and K Y Guslienko},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.064418},

doi = {10.1103/PhysRevB.97.064418},

year  = {2018},

date = {2018-01-01},

journal = {Physical Review B},

volume = {97},

pages = {064418},

abstract = {We study azimuthal spin-wave (SW) excitations in a circular ferromagnetic nanodot in different inhomogeneous, topologically nontrivial magnetization states, specifically, vortex, Bloch-type skyrmion, and Néel-type skyrmion states. A continuous transition between these states is realized by gradually changing the out-of-plane magnetic anisotropy and the Dzyaloshinskii-Moriya exchange interaction (DMI), and the corresponding SW spectra are calculated for each state. We observe the lifting of degeneracy of SW mode frequencies and a change in the systematics of frequency levels. The latter effect is induced by the geometric Berry phase, which occurs in SWs localized at the edge of the dot in the vortex state, and vanishes in the skyrmion states. Furthermore, channeling of edge-localized azimuthal SWs and a related large frequency splitting are observed in the skyrmion states. This is attributed to DMI-induced nonreciprocity, while the coupling of the breathing and gyrotropic modes is related to the skyrmion motion. Finally, we demonstrate efficient coupling of the dynamic magnetization to a uniform magnetic field in nanodots of noncircular symmetry in the skyrmion states.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{co&contra,

title = {Co- and contra-directional vertical coupling between ferromagnetic layers with grating for short-wavelength spin wave generation},

author = {Piotr Graczyk and Mateusz Zelent and Maciej Krawczyk},

url = {http://iopscience.iop.org/article/10.1088/1367-2630/aabb48/meta},

doi = {10.1088/1367-2630/aabb48},

year  = {2018},

date = {2018-01-01},

journal = {New Journal of Physics},

volume = {20},

pages = {053021},

abstract = {The possibility to generate short spin waves (SWs) is of great interest in the field of magnonics nowadays. We present an effective and technically affordable way of conversion of long SWs, which may be generated by conventional microwave antenna, to the short, sub-micrometer waves. It is achieved by grating-assisted resonant dynamic dipolar interaction between two ferromagnetic layers separated by some distance. We analyze criteria for the optimal conversion giving a semi-analytical approach for the coupling coefficient. We show by the numerical calculations the efficient energy transfer between layers which may be either of co-directional or contra-directional type. Such a system may operate either as a short spin wave generator or a frequency filter, moving forward possible application of magnonics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{collimation,

title = {Connection of collimation, asymmetric beaming, and independent transmission-reflection processes in concentric-groove gratings supporting spoof surface plasmons},

author = {M Habib and Andriy E Serebryannikov and H Caglayan and G A Vandenbosch},

url = {https://link.springer.com/article/10.1007%2Fs11468-018-0850-z},

doi = {10.1007/s11468-018-0850-z},

year  = {2018},

date = {2018-01-01},

journal = {Plsmonics},

abstract = {Transmission through subwavelength apertures enables separation of the incidence half-space and the exit half-space, which leads to that the spatial distribution of the field in the latter is not affected by the distribution in the former. The distribution in the exit half-space is mainly determined by the properties of surface plasmons (SPs) at the exit-side interface. In this paper, for the microwave structures with one-side concentric corrugations around a single annular hole, we demonstrate the possible connections between asymmetric transmission in the beaming regime and collimation of the waves incident 

at different angles, which can be considered as two sides of the same phenomenon occurring due to the common effect of such a separation and the radiation shaping effect being possible due to the spoof SPs at the corrugated exit interface. Collimation manifests itself in that the waves incident at different angles from a wide range contribute to the single outgoing beam so that a far-zone observer cannot distinguish between the contributions of different angles of arrival. Asymmetry in transmission manifests itself in that the spatial shaping of radiation (beaming) in the exit half-space appears only for one of the two opposite incidence directions. Moreover, even in the structures with the same corrugations on both sides, i.e., without asymmetric transmission, spatial separation of two wave processes, e.g., two symmetric or asymmetric collimation processes, can be obtained for a wide range of nonzero angles of incidence.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{phase18,

title = {Control of the spin wave whase in transmission through the ultrathin interface between exchange coupled ferromagnetic materials},

author = {M Milian and O Gorobets and Yu Gorobets and Mateusz Zelent and Maciej Krawczyk},

url = {http://przyrbwn.icm.edu.pl/APP/PDF/133/app133z3p044.pdf},

doi = {10.12693/APhysPolA.133.480},

year  = {2018},

date = {2018-01-01},

journal = {Acta Physica Polonica A},

volume = {133},

pages = {480},

abstract = {In this paper, we show analytically and numerically, that the ultrathin metallic layer up to few monatomic layers separating two ferromagnetic media, which are exchange coupled, can effectively change the phase of the reflected or transmitted spin waves. Taking into account ground states with parallel orientations of the magnetization vectors, we developed the analytical model, which shows the possibility of spin-wave phase control by varying the exchange coupling strength between two ferromagnets. Moreover, we demonstrate with micromagnetic simulations that the effect still exists for the spin waves propagating in thin ferromagnetic film during the reflection or transmission from the interface, where interlayer exchange interactions are present.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{optically_induced_MC,

title = {Driving magnetization dynamics in an on-demand magnonic crystal via the magnetoelastic interactions},

author = {C L Chang and Szymon Mieszczak and Mateusz Zelent and V Besse and U Martens and R R Tamming and J Janusonis and Piotr Graczyk and M Münzenberg and Jarosław W Kłos and R I Tobey},

url = {http://dx.doi.org/10.1103/PhysRevApplied.10.064051},

doi = {10.1103/PhysRevApplied.10.064051},

year  = {2018},

date = {2018-01-01},

journal = {Physical Review Applied},

volume = {10},

pages = {064051},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kosevich,

title = {Excitation of bulk spin waves by acoustic wave at the plane defect of a ferromagnet},

author = {Y Gusieva and Piotr Graczyk and O Gorobets and Maciej Krawczyk},

url = {http://przyrbwn.icm.edu.pl/APP/PDF/133/app133z3p047.pdf},

doi = {10.12693/APhysPolA.133.489},

year  = {2018},

date = {2018-01-01},

journal = {Acta Physica Polonica A},

volume = {133},

pages = {489},

abstract = {Excitation of bulk spin waves by acoustic wave localized on the elastic planar defect in the bulk ferromagnet was analytically and numerically investigated. We showed that besides magnetic oscillations forced by acoustic wave strain the resonance between Kosevich wave and bulk spin wave can occurs. For the frequency of the Kosevich wave far below the resonance frequency the amplitude of dynamic magnetization is negligible. For the frequency above the resonance the acoustic wave excites bulk spin wave of the same frequency but different absolute value of the wave vector.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{GHS2018,

title = {Goos–Hänchen effect for Brillouin light scattering by acoustic phono},

author = {Yu S Dadoenkova and N N Dadoenkova and Maciej Krawczyk and I Lyubchanskii},

url = {https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-16-3965},

doi = {10.1364/OL.43.003965},

year  = {2018},

date = {2018-01-01},

journal = {Optics Letters},

volume = {43},

pages = {3965},

abstract = {The lateral shift of an optical beam undergoing Brillouin light scattering on an acoustic wave (AW) in the total internal reflection geometry is studied theoretically. It is shown that the lateral shift depends on polarization (longitudinal or transversal) of the AW, as well as on the type of scattering process: a direct one, when the scattered wave undergoes a lateral shift at reflection from the interface, or a cascading one, when a fundamental frequency light beam is laterally shifted at reflection and then scattered on the AW.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{hartman,

title = {Hartman effect for spin waves in exchange regime},

author = {Jarosław W Kłos and Yu S Dadoenkova and Justyna Rychły and N N Dadoenkova and I L Lyubchanskii and J Barnaś},

url = {https://doi.org/10.1038/s41598-018-35761-1},

doi = {10.1038/s41598-018-35761-1},

year  = {2018},

date = {2018-01-01},

journal = {Scientific Reports},

volume = {8},

pages = {17944},

abstract = {Hartman effect for spin waves tunnelling through a barrier in a thin magnetic film is considered theoretically. The barrier is assumed to be created by a locally increased magnetic anisotropy field. The considerations are focused on a nanoscale system operating in the exchange-dominated regime. We derive the formula for group delay τgr of a spin wave packet and show that τgr saturates with increasing barrier width, which is a signature of the Hartman effect predicted earlier for photonic and electronic systems. In our calculations, we consider the general boundary conditions which take into account different strength of exchange coupling between the barrier and its surrounding. As a system suitable for experimental observation of the Hartman effect we propose a CoFeB layer with perpendicular magnetic anisotropy induced by a MgO overlayer.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ellipses,

title = {Magnonic band gap and mode hybridization in continuous permalloy films induced by vertical dynamic coupling with an array of permalloy ellipses},

author = {Piotr Graczyk and Maciej Krawczyk and S Dhuey and W-G Yang and H Schmidt},

url = {https://link.aps.org/doi/10.1103/PhysRevB.98.174420},

doi = {10.1103/PhysRevB.98.174420},

year  = {2018},

date = {2018-01-01},

journal = {Physical Review B},

volume = {98},

pages = {174420},

abstract = {We investigate dispersion relation of spin waves in a thin homogeneous permalloy film decorated with a periodic array of elliptically shaped permalloy dots and separated by a nonmagnetic Pt spacer. We demonstrate formation of the magnonic band structure for Damon-Eshbach waves propagating in a permalloy film with the band gaps opened at the Brillouin zone border and at smaller wave numbers, due to the Bragg interference and interaction of propagating waves of the continuous film with a standing resonant mode of the nanoellipses, respectively. We show that the predominant role in the formation of the magnonic band structure and opening band gaps is played by a vertical dynamic coupling between propagating waves and magnetization oscillations in the nanodots. The shape anisotropy of the permalloy nanodots allows us to control the spin wave dynamics through the switch between two states of the magnetization with respect to the underneath film magnetization.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{vort18,

title = {Spin wave excitations of the interacting two-dimensional in-plane nano-vortices},

author = {Sławomir Mamica},

url = {http://przyrbwn.icm.edu.pl/APP/PDF/133/app133z3p052.pdf},

doi = {10.12693/APhysPolA.133.505},

year  = {2018},

date = {2018-01-01},

journal = {Acta Physica Polonica A},

volume = {133},

pages = {505},

abstract = {The aim of this work is to study spin-wave excitations in the row of interacting two-dimensional nanodots in the vortex state. We use a discrete dipole model taking into account the nearest-neighbour exchange and dipolar interactions. Magnetic configuration of each dot is assumed to form an in-plane vortex (circular magnetization). We examine the dependence of frequencies and profiles of spin-wave modes vs. the dipolar-to-exchange interaction ratio and the dot separation. Special attention is paid to some particular modes: lowest-frequency azimuthal modes and the fundamental mode, an analogue of the uniform excitation. Some conclusions regarding the influence of the size of dots the row consists of as well as the chirality of neighbouring vortices are provided too.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Penrose,

title = {Spin waves in planar quasicrystal of Penrose tiling},

author = {Justyna Rychły and Szymon Mieszczak and Jarosław W Kłos},

url = {http://www.sciencedirect.com/science/article/pii/S0304885316329080?via%3Dihub},

doi = {10.1016/j.jmmm.2017.03.029},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {450},

pages = {18},

abstract = {We investigated two-dimensional magnonic structures which are the counterparts of photonic quasicrystals forming Penrose tiling. We considered the slab composed of Ni (or Py) disks embedded in Fe (or Co) matrix. The disks are arranged in quasiperiodic Penrose-like structure. The infinite quasicrystal was approximated by its rectangular section with periodic boundary conditions applied. This approach 

allowed us to use the plane wave method to find the frequency spectrum of eigenmodes for spin waves and their spatial profiles. The calculated integrated density of states shows more distinctive magnonic gaps for the structure composed of materials of high magnetic contrast (Ni and Fe) and relatively high filling fraction. This proves the impact of quasiperiodic long-range order on the spectrum of spin waves. 

We also investigated the localization of spin wave eingenmodes resulting from the quasiperiodicity of the structure.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2018mirage,

title = {Spin-wave beam propagation in ferromagnetic thin films with graded refractive index: Mirage effect and prospective applications},

author = {Paweł Gruszecki and Maciej Krawczyk},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.094424},

doi = {https://doi.org/10.1103/PhysRevB.97.094424},

year  = {2018},

date = {2018-01-01},

journal = {Physical Review B},

volume = {97},

pages = {094424},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ACSSI,

title = {Spin-wave dynamics in artificial anti-spin-ice systems: Experimental and theoretical investigations},

author = {Sławomir Mamica and X Zhou and A O Adeyeye and Maciej Krawczyk and G Gubbiotti},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.054405},

doi = {10.1103/PhysRevB.98.054405},

year  = {2018},

date = {2018-01-01},

urldate = {2018-01-01},

journal = {Physical Review B},

volume = {98},

pages = {054405},

abstract = {Reversed structures of artificial spin-ice systems, where elongated holes with elliptical shape (antidots) are arranged into a square arraywith two orthogonal sublattices, are referred to as antisquared spin ice. UsingBrillouin light-scattering spectroscopy and plane-wave-method calculations, we investigate the spin-wave propagation perpendicular to the applied field direction for two 20-nm-thick Permalloy nanostructures which differ by the presence of single- and double-elliptical antidots. For the spin-wave propagation along the principal antidot lattice axis, the spectrum consists of flat bands separated by several frequency gaps which are the effect of spin-wave amplitude confinement in the regions between antidots. Contrarily, for propagation direction at 45° with respect to the antidot symmetry axis, straight and narrow channels of propagation are formed, leading to broadening of bands and closing of the magnonics gaps. Interestingly, in this case, extra magnonic band gaps occur due to the additional periodicity along this direction. The width and the position of these gaps depend on the presence of single or double antidots. In this context, we discuss possibilities for the tuning of spin-wave spectra in antisquared spin-ice structures.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{plasmonb,

title = {Tailoring far-infrared surface plasmon polaritons of a single-layer graphene using plasmon-phonon hybridization in graphene-LiF heterostructures},

author = {H Hajian and Andriy E Serebryannikov and A Ghobadi and Y Demirag and B Butun and G A Vandenbosch and E Ozbay},

url = {https://www.nature.com/articles/s41598-018-31049-6},

doi = {https://www.nature.com/articles/s41598-018-31049-6},

year  = {2018},

date = {2018-01-01},

journal = {Scientific Reports},

volume = {8},

pages = {13209},

abstract = {Being one-atom thick and tunable simultaneously, graphene plays the revolutionizing role in many areas. The focus of this paper is to investigate the modal characteristics of surface waves in structures with graphene in the far-infrared (far-IR) region. We discuss the effects exerted by substrate permittivity on propagation and localization characteristics of surface-plasmon-polaritons (SPPs) in single-layer 

graphene and theoretically investigate characteristics of the hybridized surface-phonon-plasmonpolaritons (SPPPs) in graphene/LiF/glass heterostructures. First, it is shown how high permittivity of substrate may improve characteristics of graphene SPPs. Next, the possibility of optimization for surface-phonon-polaritons (SPhPs) in waveguides based on LiF, a polar dielectric with a wide polaritonic gap (Reststrahlen band) and a wide range of permittivity variation, is demonstrated. Combining graphene and LiF in one heterostructure allows to keep the advantages of both, yielding tunable hybridized SPPPs which can be either forwardly or backwardly propagating. Owing to high permittivity of LiF below the gap, an almost 3.2-fold enhancement in the figure of merit (FoM), ratio of normalized propagation length to localization length of the modes, can be obtained for SPPPs at 5–9 THz, as compared with SPPs of graphene on conventional glass substrate. The enhancement is efficiently tunable by varying the chemical potential of graphene. SPPPs with characteristics which strongly differ inside and around the polaritonic gap are found.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{temperature-1,

title = {Temperature-mediated invocation of the vacuum state for switchable ultrawide-angle and broadband deflection},

author = {Andriy E Serebryannikov and A Lakhtakia and M Aalizadeh and E Ozbay and G A E Vanderbosch},

url = {https://www.nature.com/articles/s41598-018-32977-z},

doi = {10.1038/s41598-018-32977-z},

year  = {2018},

date = {2018-01-01},

journal = {Scientific Reports},

volume = {8},

pages = {15044},

abstract = {Temperature-mediated appearance and disappearance of a deflection grating in a diffracting structure is possible by employing InSb as the grating material. InSb transits from the dielectric state to the 

plasmonic state in the terahertz regime as the temperature increases, this transition being reversible. An intermediate state is the vacuum state in which the real part of the relative permittivity of InSb 

equals unity while the imaginary part is much smaller. Then the grating virtually disappears, deflection being impossible as only specular reflection can occur. This ON/OFF switching of deflection and relevant 

angular filtering are realizable over wide ranges of frequency and incidence angle by a temperature change of as low as 20 K. The vacuum state of InSb invoked for ON/OFF switching of deflection and relevant angular filtering can also be obtained for thermally tunable materials other than InSb as well as by using non-thermal mechanisms.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}