Publications

@article{sping,

title = {The effect of magnetization pinning on the spectrum of spin waves in magnonic antidot waveguides},

author = {Jarosław W Kłos and D Kumar and Javier Romero Vivas and M Franchin and Maciej Krawczyk and H Fangohr and A Barman},

url = {http://prb.aps.org/abstract/PRB/v86/i18/e184433},

doi = {10.1103/PhysRevB.86.184433},

year  = {2012},

date = {2012-01-01},

journal = {Physical Review B},

volume = {86},

pages = {184433},

abstract = {We study the spin-wave spectra in magnonic antidot waveguides (MAWs) for two limiting cases (strong and negligible) of the surface anisotropy at the ferromagnet/air interface. The MAWs under investigation have the form of a thin stripe of permalloy with a single row of periodically arranged antidots in the middle. The introduction of a magnetization pinning at the edges of the permalloy stripe and the edges of antidots is found to modify the spin-wave spectrum. This effect is shown to be necessary for magnonic gaps to open in the considered systems. Our study demonstrates that the surface anisotropy can be crucial in the practical applications of MAWs and related structures and in the interpretation of experimental results in one- and two-dimensional magnonic crystals. We used three different numerical methods, i.e., plane waves method (PWM), finite difference method, and finite element method to validate the results. We showed that PWM in the present formulation assumes pinned magnetization, while in micromagnetic simulations special care must be taken to introduce pinning.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{koral12,

title = {The Faraday effect of natural and artificial ferritins},

author = {Marceli Koralewski and Jarosław W Kłos and M Baranowski and Z Mitróová and P Kopčanský and L Melníková and M Okuda and W Schwarzacher},

url = {http://iopscience.iop.org/0957-4484/23/35/355704/},

doi = {10.1088/0957-4484/23/35/355704},

year  = {2012},

date = {2012-01-01},

journal = {Nanotechnology},

volume = {23},

pages = {355704},

abstract = {Measurements of the Faraday rotation at room temperature over the light wavelength range of 300–680 nm for horse spleen ferritin (HSF), magnetoferritin with different loading factors (LFs) and nanoscale magnetite and Fe2O3 suspensions are reported. The Faraday rotation and the magnetization of the materials studied present similar magnetic field dependences and are characteristic of a superparamagnetic system. The dependence of the Faraday rotation on the magnetic field is described, excluding HSF and Fe2O3, by a Langevin function with a log-normal distribution of the particle size allowing the core diameters of the substances studied to be calculated. It was found that the specific Verdet constant depends linearly on the LF. Differences in the Faraday rotation spectra and their magnetic field dependences allow discrimination between magnetoferritin with maghemite and magnetite cores which can be very useful in biomedicine.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2D_magnon_ex_dipole,

title = {The impact of the lattice symmetry and the inclusion shape on the spectrum of 2D magnonic crystals},

author = {Jarosław W Kłos and Mykhaylo Sokolovskyy and Sławomir Mamica and Maciej Krawczyk},

url = {http://link.aip.org/link/?JAP/111/123910},

doi = {10.1063/1.4729559},

year  = {2012},

date = {2012-01-01},

journal = {Journal of Applied Physics},

number = {111},

pages = {123910},

abstract = {We investigate spin waves in two-dimensional superlattices in the form of an infinite ferromagnetic slab of finite thickness with periodically embedded ferromagnetic inclusions. One of the reasons of the interest in magnonic superlattices is the possibility of tailoring their spectrum to produce magnonic gaps, crucial for the prospective applications. The objective of this study is to find the optimal values of structural parameters for which low-frequency magnonic gaps will occur and have a maximum width. We provide some guidelines for designing superlattices with a desired spectrum. We focus on the role of the symmetry of the lattice versus other geometrical factors, including the filling fraction and the superlattice constant. We compare the spectra of superlattices with inclusions of circular, hexagonal, and square cross sections.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Co_Pt_multi,

title = {Time-resolved measurement of spin-wave spectra in CoO capped [Co(t)/Pt(7Å)]n-1 Co(t) multilayer systems},

author = {S Pal and Bivas Rana and R Mandal and O Hellwig and Javier Romero Vivas and Sławomir Mamica and Jarosław W Kłos and Michał Mruczkiewicz and Mykhaylo Sokolovskyy and Maciej Krawczyk},

url = {http://jap.aip.org/resource/1/japiau/v111/i7/p07C507_s1},

doi = {http://dx.doi.org/10.1063/1.3672857},

year  = {2012},

date = {2012-01-01},

urldate = {2012-01-01},

journal = {Journal of Applied Physics},

volume = {111},

pages = {07C507},

abstract = {We present an all-optical time-resolved measurement of dipole-exchange spin wave spectra in a series of CoO capped [Co(t)/Pt(7 Å)]n-1 Co(t) multilayer systems, where the total Co moment (n × t) is constant. In general, the spectra consist of two intense peaks and additional lower intensity peaks. The observed spin wave modes are modeled by a discrete dipole approximation. The frequency of the spin wave bands depends significantly upon the magnetic anisotropy and the lattice spacing between planes. Both symmetric and anti-symmetric modes are observed from the calculation of the spin-wave profiles across the multilayer in the out-of-plane direction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Meti,

title = {Towards high-frequency negative permeability using magnonic crystals in metamaterial design},

author = {Michał Mruczkiewicz and Maciej Krawczyk and R Mikhaylovskiy and V V Kruglyak},

url = {http://prb.aps.org/abstract/PRB/v86/i2/e024425},

doi = {10.1103/PhysRevB.86.024425},

year  = {2012},

date = {2012-01-01},

journal = {Physical Review B},

volume = {86},

pages = {024425},

abstract = {We investigate the magnonic properties of thin slabs of one-dimensional magnonic crystals with the aim of obtaining a structure that possesses negative permeability at high frequencies. Metamaterials of this kind could be used within devices based on the negative refractive index phenomenon. We calculate the relative excitation strengths of different spin-wave modes in one-dimensional magnonic crystals.We find that the coupling between light and high-order magnonic modes can be significant for the specific design of the magnonic structure. These results suggest that magnonic crystals are therefore promising candidates for the negative refractive index metamaterials.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mardas20121548,

title = {Radiation sterilized bone response to dynamic loading},

author = {M Mardas and L Kubisz and Piotr Biskupski and Sławomir Mielcarek and M Stelmach-Mardas and I Kałuska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861850087&doi=10.1016%2fj.msec.2012.04.041&partnerID=40&md5=6264ed9f3c86d1ca41900e3a0e3bb969},

doi = {10.1016/j.msec.2012.04.041},

issn = {09284931},

year  = {2012},

date = {2012-01-01},

journal = {Materials Science and Engineering C},

volume = {32},

number = {6},

pages = {1548-1553},

abstract = {Allogeneic bone grafts are used on a large scale in surgeries. To avoid the risk of infectious diseases, allografts should be radiation-sterilized. So far, no international consensus has been achieved regarding the optimal radiation dose. Many authors suggest that bone sterilization deteriorates bone mechanical properties. However, no data on the influence of ionizing radiation on bone dynamic mechanical properties are available. Bovine femurs from 2-year old animal were machine cut and irradiated with the doses 10, 15, 25, 35, 45 and 50 kGy. Dynamic mechanical analysis was performed at 1-10 Hz at the temperature range of 0-350°C in 3-point bending configuration. No statistically significant differences in storage modulus were observed. However, there were significant decreased values of loss modulus between the samples irradiated with doses of 10 (↓14.3%), 15, 45 and 50 kGy (↓33.2%) and controls. It was stated that increased irradiation dose decreases the temperature where collagen denaturation process starts and increases the temperature where the collagen denaturation process finishes. It was shown that activation energy of denaturation process is significantly higher for the samples irradiated with the dose of 50 kGy (615 kJ/mol) in comparison with control samples and irradiation with other doses (100-135 kJ/mol). © 2012 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Trzaskowska201296,

title = {The effect of nickel nanostructure on surface waves propagation in silicon support},

author = {Aleksandra Trzaskowska and Sławomir Mielcarek and Bartosz Graczykowski and Bogusław Mróz and P Patoka and M Giersig},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859521596&doi=10.1016%2fj.jallcom.2012.03.011&partnerID=40&md5=daa96bee95fb0a422ff35375780bf86c},

doi = {10.1016/j.jallcom.2012.03.011},

issn = {09258388},

year  = {2012},

date = {2012-01-01},

journal = {Journal of Alloys and Compounds},

volume = {527},

pages = {96-100},

abstract = {Surface Brillouin spectroscopy was applied to characterise the dynamics of surface acoustic waves in a silicon-based nanocomposite. The propagation velocities of Rayleigh phonons and their anisotropy in silicon support (1 1 1) loaded with a nanosized nickel island structure were determined. Deposition of a 2D nickel nanostructure on silicon substrate leads to the appearance of new peaks in the Brillouin spectrum. © 2011 Elsevier Ltd. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Graczykowski2012263,

title = {Rayleigh surface waves propagating in (111) Si substrate decorated with Ni phononic nanostructure},

author = {Bartosz Graczykowski and Sławomir Mielcarek and Aleksandra Trzaskowska and P Patoka and M Giersig},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84862331800&doi=10.1063%2f1.3703185&partnerID=40&md5=d8b356e67560284cd8a1474610a34aea},

doi = {10.1063/1.3703185},

issn = {0094243X},

year  = {2012},

date = {2012-01-01},

journal = {AIP Conference Proceedings},

volume = {1433},

pages = {263-266},

abstract = {The paper reports results of the Surface Brillouin Light Scattering at the silicon (111) surface loaded with a periodic 2D nickel nanostructure. Measurements were made for samples loaded with nanostructures of different period (different size) but of the same height. The relation between the nanostructure size and the velocity of surface Rayleigh waves was proved to be nonlinear. Anisotropy of the surface Rayleigh wave velocity was compared with the results of theoretical modelling based on the Finite Element Method. © 2012 American Institute of Physics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mielcarek2012175,

title = {Hypersonic surface waves in 2D titanium nanostructure on silicon},

author = {Sławomir Mielcarek and Aleksandra Trzaskowska and Bartosz Graczykowski and J Sarkar},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859314864&doi=10.1002%2fpssr.201206039&partnerID=40&md5=1d2cf5685821db19c7d39c735107eb2d},

doi = {10.1002/pssr.201206039},

issn = {18626254},

year  = {2012},

date = {2012-01-01},

journal = {Physica Status Solidi - Rapid Research Letters},

volume = {6},

number = {4},

pages = {175-177},

abstract = {The non-destructive method of Brillouin spectroscopy was applied to investigate the vibrations of 2D titanium nanoislands. Simulations realized by the Finite Element Method permitted determination of the dispersion relations of the surface waves propagating in the island structure and silicon substrate as well as the width of the frequency gap for the system studied. 3D maps of unit cell deformation for the structure with nanoislands for individual modes were obtained. The Brillouin experiment is shown as an excellent tool for direct experimental determination of the presence of eigenvibrations and the frequency gap in phononic structures in the GHz range. Exemplary 3D map of unit cell deformation for the structure with titanium nanoislands of 150 nm. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Trzaskowska2012132,

title = {Surface waves investigation in NiFe/Au/Co/Au multilayers by high-resolution Brillouin spectroscopy},

author = {Aleksandra Trzaskowska and Sławomir Mielcarek and Bartosz Graczykowski and F Stobiecki},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84856209859&doi=10.1016%2fj.jallcom.2011.12.059&partnerID=40&md5=2c2400fb56c5a9bed9c2cf12b904587d},

doi = {10.1016/j.jallcom.2011.12.059},

issn = {09258388},

year  = {2012},

date = {2012-01-01},

journal = {Journal of Alloys and Compounds},

volume = {517},

pages = {132-138},

abstract = {The behaviour of Rayleigh and Sezawa surface phonons propagating in magnetic multilayers [Ni 80Fe 20/Au/Co/Au] 10 on silicon substrate was studied by high-resolution Brillouin spectroscopy. The dispersion dependence of the phase velocity was determined as a function of wavenumber and the angular dispersion was tested. A simulation of the dispersion dependence was made by the finite element method and the results were compared with those of the experiment. © 2011 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Idzikowski201275,

title = {Mechanical properties of amorphous and partially crystallized Y50Cu42Al8 alloys},

author = {B Idzikowski and Sławomir Mielcarek and P Misiuna and Z Śniadecki and A C Brańka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80155140239&doi=10.1016%2fj.intermet.2011.09.011&partnerID=40&md5=628ab2fc06135acc702b728267ae484f},

doi = {10.1016/j.intermet.2011.09.011},

issn = {09669795},

year  = {2012},

date = {2012-01-01},

journal = {Intermetallics},

volume = {21},

number = {1},

pages = {75-79},

abstract = {The mechanical properties of ternary Y-Cu-Al alloys produced by the melt spinning method have been investigated by Brillouin spectroscopy and combined with calculations of the effective moduli method. Structural studies and TEM images demonstrated that the alloy can form amorphous, two- and three-phase composite and polycrystalline microstructures. The elastic moduli of ribbons with different microstructures were estimated as a function of the volume fraction of the YCu nanocrystallites. It is shown that the ductility of the amorphous and two-phase composite forms are comparable to that of the YCu single crystal. The formation of YCuAl crystallites, in addition to the YCu crystallites, lowers the ductility of the alloy. © 2011 Elsevier Ltd. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Reshak20121922,

title = {Amino acid 2-aminopropanoic CH3CH(NH2)COOH crystals: Materials for photo- and acoustoinduced optoelectronic applications},

author = {A H Reshak and G Lakshminarayana and H Kamarudin and I V Kityk and S Auluck and J Berdowski and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867266231&doi=10.1007%2fs10854-012-0890-7&partnerID=40&md5=1f169d88b92b93eba287446483895531},

doi = {10.1007/s10854-012-0890-7},

issn = {09574522},

year  = {2012},

date = {2012-01-01},

journal = {Journal of Materials Science: Materials in Electronics},

volume = {23},

number = {10},

pages = {1922-1931},

abstract = {Photo-induced treatment of L-alanine single crystals grown by slow evaporation method at an ambient temperature was performed using a 25 ps Nd:YAG pulsed laser in the presence of an external acoustic filed. The changes of the absorption were studied for the wavelength 265 nm near the energy band gap edge at acoustical power density varying within 4-6 W/cm 2. The observed absorption changes indicate that the external optical electric field strengths and acoustical power densities may be efficient parameters for the characterization of photo-optical and acousto-optical treatment of the samples. From the X-ray diffraction data we have optimized the atomic positions assuming that force on the atoms is around 1 mRy/au. These are used to calculate the electronic structure and the chemical bonding for the amino acid L-alanine single crystals. The calculated electronic band structure and densities of states confirms the experimental results that this compound possesses a relatively large energy band gap. The upper valence band has its maximum at the Z point of the Brillouin zone while the conduction band minimum is located at Γ point in the zone center, resulting in an indirect energy band gap. The electronic energy gap is equal to 4.19 eV within a framework of the used local density approximation and 4.54 eV with the Engel-Vosko generalized gradient approximation as the exchange correlation potential. This is in an agreement with our experimentally measured energy band gap ~4.67 eV. The existence of O-p character in the upper valence band has a significant consequence for the optical band gap. From our calculated electron charge density distribution, we obtain a space electron charge density distribution in the average unit cell of the crystal. The chemical bonding features of L-alanine amino acid were analyzed. © Springer Science+Business Media, LLC 2012.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tylczyński2012973,

title = {Comment on "Structural, dielectric, optical and ferroelectric property of urea succinic acid crystals grown in aqueous solution containing maleic acid" by B.K. Singh et al. [J. Phys. Chem. Solids 71 (2010) 1774]},

author = {Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859601295&doi=10.1016%2fj.jpcs.2012.03.008&partnerID=40&md5=0f0d3ab1a3596b576c48eb28a1e9ca6e},

doi = {10.1016/j.jpcs.2012.03.008},

issn = {00223697},

year  = {2012},

date = {2012-01-01},

journal = {Journal of Physics and Chemistry of Solids},

volume = {73},

number = {7},

pages = {973-974},

publisher = {Elsevier Ltd},

abstract = {The volume of elementary cell of the urea succinic acid (M-USA) growing from a solution containing 1 mol% maleic acid is 69% greater than that of urea succinic acid (USA) grown in the usual conditions. M-USA crystallises in the monoclinic system with a centre of symmetry, which excludes the piezoelectric and ferroelectric properties. The results presented in the paper commented on are artefacts. © 2012 Elsevier Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Graczykowski2012c,

title = {Tuning of a hypersonic surface phononic band gap using a nanoscale 2D lattice of pillars},

author = {Bartosz Graczykowski and Sławomir Mielcarek and Aleksandra Trzaskowska and J Sarkar and P Hakonen and Bogusław Mróz},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84865084952&doi=10.1103%2fPhysRevB.86.085426&partnerID=40&md5=ef5a90354d3ad0392dd4e4a5dc3342bc},

doi = {10.1103/PhysRevB.86.085426},

issn = {10980121},

year  = {2012},

date = {2012-01-01},

journal = {Physical Review B - Condensed Matter and Materials Physics},

volume = {86},

number = {8},

abstract = {We present experimental and theoretical evidence of a phononic band gap in a hypersonic range for thermally activated surface acoustic waves in two-dimensional (2D) phononic crystals. Surface Brillouin light scattering experiments were performed on the (001) surface of silicon, loaded with a 2D square lattice of 100- or 150-nm-high aluminum pillars with a spacing of 500nm. The surface Brillouin light scattering spectra revealed a different type of surface mode, related to the modulation of the lattice structure and the mechanical eigenmodes of the pillars. The experimental data were in excellent agreement with theoretical calculations performed using the finite-element method. © 2012 American Physical Society.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lehmann-Szweykowska20121108,

title = {Anomalous phase transitions in LiCsSO4 in the compressible hcp ising model},

author = {A Lehmann-Szweykowska and M Kurzyński and R Wojciechowski and Maciej Wiesner and Bogusław Mróz},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861998196&doi=10.12693%2fAPhysPolA.121.1108&partnerID=40&md5=da5127210fb233498c172fc42ecf7782},

doi = {10.12693/APhysPolA.121.1108},

issn = {05874246},

year  = {2012},

date = {2012-01-01},

journal = {Acta Physica Polonica A},

volume = {121},

number = {5-6},

pages = {1108-1110},

publisher = {Polish Academy of Sciences},

abstract = {Structural low-temperature phase transformations in LiCsSO4 are analysed in a newly tailored simple model of the static soliton in the periodically modulated phases of the one-dimensional compressible Ising model. It is shown that the original hcp symmetry is crucial for understanding of the anomalous temperature-dependence of the Brillouin shift.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Reshak201117219,

title = {Dispersion of linear and non-linear optical susceptibilities for amino acid 2-aminopropanoic CH3CH(NH2)COOH single crystals: Experimental and theoretical investigations},

author = {A H Reshak and S Auluck and D Stys and I V Kityk and H Kamarudin and J Berdowski and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80054911978&doi=10.1039%2fc1jm12361k&partnerID=40&md5=4cc424aede7670cf0280484b4b0cf620},

doi = {10.1039/c1jm12361k},

issn = {09599428},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Materials Chemistry},

volume = {21},

number = {43},

pages = {17219-17228},

abstract = {A comprehensive experimental and theoretical investigation of dispersion of the linear and nonlinear optical susceptibilities for amino acid l-alanine single crystals is reported. The state-of-the-art full potential linear augmented plane wave method, within a framework of the density functional theory was applied. The atomic positions from X-ray diffraction have been optimized so that the force on each atom is around 1 mRy au-1. This relaxed geometry has been used for the theoretical calculations. The complex dielectric susceptibility dispersion, its zero-frequency limit and the birefringence of amino acid l-alanine single crystals were studied. The crystal exhibits a large uniaxial dielectric anisotropy resulting in a significant birefringence. The calculated birefringence at static limit is 0.072 and 0.074 at λ = 1064 nm (corresponding to 1.165 eV) in good agreement with the measured value (0.073). We also report calculations of the complex second-order optical susceptibility dispersions for the principal tensor components: χ(2)123(ω), χ(2)231(ω) and χ(2)312(ω). The calculated second order susceptibility tensor components χ(2)123(ω), χ(2)231(ω), and χ(2)312(ω) at λ = 1064 nm are compared with those obtained from our measurements performed using the 25 ps Nd:YAG pulsed laser at λ = 1064 nm. Our calculations are in reasonably good agreement with our experimental data. In addition we have calculated the microscopic second order hyperpolarizability, β123, vector component along the principal dipole moment directions for the dominant component χ(2)123(ω) and it is found to be 0.21 × 10 -21 pm V-1 in the static limit and 0.27 × 10 -21 pm V-1 at 1.165 eV (λ = 1064 nm) in comparison with our measured value (0.31 × 10-21 pm V-1) at λ = 1064 nm. Additional study of the second order susceptibilities versus the external laser treatment is performed. © 2011 The Royal Society of Chemistry.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Vachon2011,

title = {The nature of the low-energy excitations in the short-range-ordered region of Cs2CuCl4 as revealed by 133Cs nuclear magnetic resonance},

author = {M-A Vachon and G Koutroulakis and V F Mitrović and O Ma and J B Marston and A P Reyes and P Kuhns and R Coldea and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80053405692&doi=10.1088%2f1367-2630%2f13%2f9%2f093029&amp},

doi = {10.1088/1367-2630/13/9/093029},

issn = {13672630},

year  = {2011},

date = {2011-01-01},

journal = {New Journal of Physics},

volume = {13},

abstract = {We report nuclear magnetic resonance (NMR) measurements of the spin-1/2 anisotropic triangular lattice antiferromagnet Cs2CuCl4 as a function of temperature and applied magnetic field. The observed temperature and magnetic field dependence of the NMR relaxation rate suggests that low-energy excitations in the short-range-ordered region stabilized over a wide range of intermediate fields and temperatures of the phase diagram (sketched in figure 1(a)) are gapless or nearly gapless fermionic excitations. An upper bound on the size of the gap of 0.037 meV ≈ J/10 is established. The magnetization and NMR relaxation rate can be qualitatively described either by a quasi-1D picture of weakly coupled chains or by mean-field theories of specific 2D spin liquids; however, quantitative differences exist between data and theory in both cases. This comparison indicates that 2D interactions are quantitatively important in describing the low-energy physics.© IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lakshminarayana2011721,

title = {Size and nonlinear optical effects of ferroic organic nanocomposites},

author = {G Lakshminarayana and KapustianykV. and K Ozga and V Rudyk and I V Kityk and M G Brik and J Berdowski and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80052454250&doi=10.1007%2fs00339-011-6327-y&partnerID=40&md5=ef0569e5bfea5229769326d7ce61e3d3},

doi = {10.1007/s00339-011-6327-y},

issn = {09478396},

year  = {2011},

date = {2011-01-01},

journal = {Applied Physics A: Materials Science and Processing},

volume = {104},

number = {2},

pages = {721-726},

abstract = {The third harmonic generation of ferroic (NH2(C 2H5)2)2CuCl4 diethylammonium cuprate chlorate (DEACC) single crystals and nanocrystals (NCs) incorporated into polymethyl methacrylate (PMMA) polymer matrices was investigated. It was established that the crystal field spectra of Cu 2+ ion determines the observed size dependence effect. The role of nanocrystallite size and content and the symmetry of the THG at ambient and nitrogen temperatures were studied. © Springer-Verlag 2011.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ozga20111734,

title = {Photoinduced absorption and nonlinear optics of triglycine selenate single crystals under uniaxial pressure},

author = {K Ozga and A H Reshak and J Berdowski and Zbigniew Tylczyński and A Wojciechowski and A Ślȩzak and I V Kityk},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79953906314&doi=10.1016%2fj.matlet.2011.03.003&partnerID=40&md5=ad42712a3ec0b2acb2f0d69489396394},

doi = {10.1016/j.matlet.2011.03.003},

issn = {0167577X},

year  = {2011},

date = {2011-01-01},

journal = {Materials Letters},

volume = {65},

number = {11},

pages = {1734-1736},

abstract = {We studied an influence of uniaxial pressure on the triglycine selenate single crystals during simultaneous illumination by the continuous wave 532 laser at power about 300 mW. Simultaneously we have studied two-photon absorption for the nanosecond 1064 nm Nd:YAG laser fundamental wavelength. The studies were performed during several cycles of applied uniaxial pressure. A correlation between the photoinduced absorption and the two-photon absorption was found. © 2011 Elsevier B.V.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tylczyński2011722,

title = {Depression of the ferroelastic phase transition in LiCsSO4 by uniaxial stress},

author = {Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79952101849&doi=10.2478%2fs11534-010-0064-2&partnerID=40&md5=b56688c68c2e91d4cc4e6ced00cd1190},

doi = {10.2478/s11534-010-0064-2},

issn = {18951082},

year  = {2011},

date = {2011-01-01},

journal = {Central European Journal of Physics},

volume = {9},

number = {3},

pages = {722-728},

abstract = {In the lithium-caesium sulphate crystal in the temperature range of ferroelastic phase transition, the uniaxial stress σX induced changes in velocity and attenuation of the longitudinal ultrasonic wave propagating in the direction [010] are studied. The phase transition is close to the three-critical point and the critical exponent is κ = 0.27 ± 0. 02. The stress applied drastically decreases the stepwise change in the wave velocity at TC up to its disappearance at 2 MPa. In the temperature range between TC and TC - 6 K, the stress leads to an increase in the wave velocity and a decrease in its attenuation. This range was interpreted as that of co-existence of ferroelastic and incommensurate ordering, in which the stress influences the density of solitons leading to stiffening of the crystal lattice. © 2010 Versita Warsaw and Springer-Verlag Berlin Heidelberg.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wojtas2011,

title = {Organic-inorganic compounds with strong nonlinear optical properties based on 2,4,6-trimethylpyridinium and tetrahedral BF4- networks},

author = {M Wojtaś and A Bil and R Jakubas and A Ga̧gor and A Pietraszko and O Czupiński and Zbigniew Tylczyński and D Isakov},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79961059236&doi=10.1103%2fPhysRevB.83.144103&partnerID=40&md5=1d148b639298d624588e53fd76ddf3a0},

doi = {10.1103/PhysRevB.83.144103},

issn = {10980121},

year  = {2011},

date = {2011-01-01},

journal = {Physical Review B - Condensed Matter and Materials Physics},

volume = {83},

number = {14},

abstract = {A different organic-inorganic crystal-[2,4,6-trimethylpyridinium][BF 4]-of nonlinear optical properties at room temperature was synthesized and characterized. The compound is built up of the organic [2,4,6-trimethylpyridinium] cations incorporated into inorganic, tetrahedral BF4 anions. It crystallizes at room temperature in the polar space group Pmn21, and undergoes three first-order phase transitions at [cooling (heating)] 241 (245) K, 297 (328) K, and 389 (406) K. The lowest temperature ferroic phase transition (ferroelastic; mm2→m type) is related to the significant pyroelectric effect. The compound was studied by single-crystal x-ray diffraction at several temperatures, using thermal (differential scanning calorimetry and thermogravimetric analysis) methods and dielectric spectroscopy. The piezoelectric, pyroelectric, and second-harmonic generation (SHG) properties were determined. Density-functional theory calculations in two stable phases are given. The [2,4,6-trimethylpyridinium] [BF4] crystal exhibits a SHG efficiency of 1.7 times that of KDP. The mechanism of structural phase transitions in the title compound is discussed. © 2011 American Physical society.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kityk20111575,

title = {Photoinduced effects in γ-glycine nanocrystallites embedded in polymer matrices},

author = {I V Kityk and N Alzayed and J Berdowski and Zbigniew Tylczyński and I Fuks-Janczarek and R Miedziński and G Lakshminarayana},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79651472916&doi=10.1016%2fj.optcom.2010.11.002&partnerID=40&md5=4fe5f97ec7c72ca9a94cc3b98e85c5b3},

doi = {10.1016/j.optcom.2010.11.002},

issn = {00304018},

year  = {2011},

date = {2011-01-01},

journal = {Optics Communications},

volume = {284},

number = {6},

pages = {1575-1577},

abstract = {We have established a principal role of the polarity of polymer matrices on the piezooptical dispersion of the γ-glycine nanocrystallites embedded into the polymethymethacrylate (PMMA) and polycarbonate (PC) matrices. We found that the optical treatment by bicolor two laser beams at 1064 nm and 532 nm which are originating from the same 10 ns Nd:YAG laser, causes occurrence of the piezooptical effects. The optimal content of the γ-glycine nanocrystallites with respect to the magnitude of piezooptical coefficients was within the range of size 50-80 nm, corresponding to the 6.5 wt.%. We studied relaxation and spectral dependence of the corresponding coefficients of the piezooptic tensor. © 2010 Elsevier B.V. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Biskupski2011696b,

title = {Effect of anticacking agents on the caking susceptibility of technical magnesium salts [Wpływ dodatków środków przeciwibryleniowych na skłonnośé do zbrylania technicznych soli magnezu]},

author = {A Biskupski and P Malinowski and Piotr Biskupski and P Rusek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79959381387&partnerID=40&md5=78245f185eb47b7e970d65fe510a6aaa},

issn = {00332496},

year  = {2011},

date = {2011-01-01},

journal = {Przemysł Chemiczny},

volume = {90},

number = {5},

pages = {696-698},

abstract = {Six com. anticaking agents were added in aq. solns. to MgSO 4·7H2O and Mg(NO3)2· 6H2O crystals at 40°C. After removal of H2O by evapn., the salts were thermostated under pressure and changing temp. (20-40°C) for 24 h as cones. The disintegrating force was the measure of the caking ability. The org. sulfonates and amines were the most efficient anticaking agents.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fay2011,

title = {Shot noise and conductivity at high bias in bilayer graphene: Signatures of electron-optical phonon coupling},

author = {A Fay and R Danneau and J K Viljas and F Wu and M Y Tomi and J Wengler and Maciej Wiesner and P J Hakonen},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84855417493&doi=10.1103%2fPhysRevB.84.245427&partnerID=40&md5=8bbe71ff8045931fe12aa03607f67301},

doi = {10.1103/PhysRevB.84.245427},

issn = {10980121},

year  = {2011},

date = {2011-01-01},

journal = {Physical Review B - Condensed Matter and Materials Physics},

volume = {84},

number = {24},

abstract = {We have studied electronic conductivity and shot noise of bilayer graphene (BLG) sheets at high bias voltages and low bath temperature T 0=4.2 K. As a function of bias, we find initially an increase of the differential conductivity, which we attribute to self-heating. At higher bias, the conductivity saturates and even decreases due to backscattering from optical phonons. The electron-phonon interactions are also responsible for the decay of the Fano factor at bias voltages V>0.1 V. The high bias electronic temperature has been calculated from shot-noise measurements, and it goes up to ∼1200 K at V=0.75 V. Using the theoretical temperature dependence of BLG conductivity, we extract an effective electron-optical phonon scattering time τ e-op. In a 230-nm-long BLG sample of mobility μ=3600 cm2V -1s -1, we find that τ e-op decreases with increasing voltage and is close to the charged impurity scattering time τ imp=60 fs at V=0.6 V. © 2011 American Physical Society.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tylczyski2011,

title = {Temperature dependences of piezoelectric, elastic and dielectric constants of L-alanine crystal},

author = {Zbigniew Tylczyński and Angelina Sterczyńska and Maciej Wiesner},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84856377913&doi=10.1088%2f0953-8984%2f23%2f35%2f355901&partnerID=40&md5=e898ee98277ce4ccfc9867cbb167e5ec},

doi = {10.1088/0953-8984/23/35/355901},

issn = {09538984},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Physics Condensed Matter},

volume = {23},

number = {35},

abstract = {Temperature changes in the components of piezoelectric, elastic and dielectric tensors were studied in L-alanine crystals in the range 100300K. A jumpwise increase in the c55 component of the elastic stiffness accompanied by maxima in damping of all face-shear modes observed at 199K in L-alanine crystal were interpreted as a result of changes in the NH 3+ vibrations occurring through electronphonon coupling. All components of the piezoelectric tensor show small anomalies in this temperature range. The components of the electromechanical coupling coefficient determined indicate that L-alanine is a weak piezoelectric. © 2011 IOP Publishing Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Viljas2011,

title = {Self-heating and nonlinear current-voltage characteristics in bilayer graphene},

author = {J K Viljas and A Fay and Maciej Wiesner and P J Hakonen},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79961119026&doi=10.1103%2fPhysRevB.83.205421&partnerID=40&md5=49b599d63d1d44440b9907dd3f85fe16},

doi = {10.1103/PhysRevB.83.205421},

issn = {10980121},

year  = {2011},

date = {2011-01-01},

journal = {Physical Review B - Condensed Matter and Materials Physics},

volume = {83},

number = {20},

abstract = {We demonstrate by experiments and numerical simulations that the low-temperature current-voltage characteristics in diffusive bilayer graphene (BLG) exhibit a strong superlinearity at finite bias voltages. The superlinearity is weakly dependent on doping and on the length of the graphene sample. This effect can be understood as a result of Joule heating. It is stronger in BLG than in monolayer graphene (MLG), since the conductivity of BLG is more sensitive to temperature due to the higher density of electronic states at the Dirac point. © 2011 American Physical Society.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Alles2011319,

title = {Atomic layer deposition of HfO2 on graphene from HfCl4 and H2O},

author = {H Alles and J Aarik and A Aidla and A Fay and J Kozlova and A Niilisk and M Pärs and M Rähn and Maciej Wiesner and P Hakonen and V Sammelselg},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79951957364&doi=10.2478%2fs11534-010-0040-x&partnerID=40&md5=9791738be255b4e40b48241b83d4726d},

doi = {10.2478/s11534-010-0040-x},

issn = {18951082},

year  = {2011},

date = {2011-01-01},

journal = {Central European Journal of Physics},

volume = {9},

number = {2},

pages = {319-324},

abstract = {Atomic layer deposition of HfO2 on unmodified graphene from HfCl4 and H2O was investigated. Surface RMS roughness down to 0. 5 nm was obtained for amorphous, 30 nm thick hafnia film grown at 180°C. HfO2 was also deposited in a two-step temperature process where the initial growth of about 1 nm at 170°C was continued up to 10-30 nm at 300°C. This process yielded uniform, monoclinic HfO2 films with RMS roughness of 1. 7 nm for 10-12 nm thick films and 2. 5 nm for 30 nm thick films. Raman spectroscopy studies revealed that the deposition process caused compressive biaxial strain in graphene, whereas no extra defects were generated. An 11 nm thick HfO2 film deposited onto bilayer graphene reduced the electron mobility by less than 10% at the Dirac point and by 30-40% far away from it. © 2011 Versita Warsaw and Springer-Verlag Berlin Heidelberg.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{magnon_supercell,

title = {Bulk and edge modes in two-dimensional magnonic crystal slab},

author = {Jarosław W Kłos and Maciej Krawczyk and Mykhaylo Sokolovskyy},

url = {http://jap.aip.org/resource/1/japiau/v109/i7/p07D311_s1},

doi = {http://dx.doi.org/10.1063/1.3536534},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Applied Physics},

volume = {109},

pages = {07D311},

abstract = {Magnonic crystals are novel materials that open a new field to explore in the domain of spin dynamics in nanoscale systems. They also hold great promise for technological applications. The bulk, matrix, and edge magnonic states in a slab of two-dimensional magnonic crystal in the form of a superlattice of arrays of cylindrical dots of finite thickness are considered. The presented calculations are based on the plane wave method reformulated to gain in generality and efficiency, with both the exchange and the demagnetizing fields taken into account. The analytical formulas for Fourier coefficients of position-dependent material parameters for finite arrays of rods of various cross-sectional geometry and arrangement in the unit cell have been derived and presented. The localization properties of the edge modes found result from the magnonic spectrum and not from the nonuniformity of the internal magnetic field.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{patt_multi,

title = {Calculation of spin wave spectra in magnetic nanograins and patterned multilayers with perpendicular anisotropy},

author = {Maciej Krawczyk and Sławomir Mamica and Jarosław W Kłos and Javier Romero Vivas and Michał Mruczkiewicz and A Barman},

url = {http://jap.aip.org/resource/1/japiau/v109/i11/p113903_s1},

doi = {10.1063/1.3586249},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Applied Physics},

volume = {109},

pages = {113903},

abstract = {We study spin-wave excitations in multilayered magnetic nanograins composed of a stack of planes with perpendicular magnetic anisotropy. The inhomogeneity is modeled through the multiple repetition of a unit cell composed of layers of two different magnetic materials. The magnetic inhomogeneity along the central axis is found to split the frequency spectrum of magnetostatic excitations into two bands, while into the number of bands in the spectrum of exchange spin waves. We show that this difference in behavior is a result of the underlying long- and short-range interactions, respectively. We describe a way of increasing the role of the dipolar interactions in the formation of magnonic bands in patterned magnetic multilayers with perpendicular anisotropy, which can allow one to obtain ferromagnetic resonance spectra with two strong absorption peaks in low and high frequencies up to the sub-THz range. Our findings open a new area for modeling the spin-wave spectra of patterned magnetic multilayers with potential applications, and for studying the role of the microscopic magnetic structure in forming spin-wave spectra.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Barcelona,

title = {Magnonic crystals and their metamaterials properties - theoretical considerations},

author = {Maciej Krawczyk and Michał Mruczkiewicz and R Mikhaylovskiy and Jarosław W Kłos and Sławomir Mamica and Mykhaylo Sokolovskyy and V V Kruglyak},

year  = {2011},

date = {2011-01-01},

journal = {Proceedings of the “Metamaterials '2011: The Fifth International Congress on Advanced Electromagnetic Materials in Microwaves and Optics},

abstract = {Magnonic crystals (MCs), or composite materials with periodically arranged magnetic inclusions, 

can have properties not found in bulk samples. In the long-wave limit the MC can be characterized by its effective continuous properties. We calculate the effective permeability of two-dimensional MCs to estimate their potential usage as negative index metamaterials.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{velocity_magnonics,

title = {Magnonic minibands in antidot lattices with large spin-wave propagation velocities},

author = {S Neusser and G Duerr and S Tacchi and M Madami and Mykhaylo Sokolovskyy and G Gubbiotti and Maciej Krawczyk and D Grundler},

url = {http://link.aps.org/doi/10.1103/PhysRevB.84.094454},

doi = {10.1103/PhysRevB.84.094454},

year  = {2011},

date = {2011-01-01},

journal = {Physical Review B},

volume = {84},

pages = {094454},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{vortex_stab,

title = {The effect of the single-spin defect on the stability of the in-plane vortex state in 2D magnetic nanodots},

author = {Sławomir Mamica and J-C S Lévy and P Depondt and Maciej Krawczyk},

url = {http://www.springerlink.com/content/481u3232657718u0/},

doi = {DOI: 10.1007/s11051-011-0308-0},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Nanoparticle Research},

volume = {13},

pages = {6075-6083},

abstract = {The aim of this study is to analyse the stability of the single in-plane vortex state in two-dimensional magnetic nanodots with a nonmagnetic impurity (single-spin defect) at the centre. Small square and circular dots including up to a few thousand of spins are studied by means of a microscopic theory with nearest-neighbour exchange interactions and dipolar interactions fully taken into account. We calculate the spin-wave frequencies versus the dipolar-to-exchange interaction ratio d to find the values of d for which the assumed state is stable. Transitions to other states and their dependence on d and the vortex size are investigated as well, with two types of transition found: vortex core formation for small d values (strong exchange interactions), and in-plane reorientation of spins for large d values (strong dipolar interactions). Various types of localized spin waves responsible for these transitions are identified.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{magnonic_1D,

title = {The magnetostatic modes in planar one-dimensional magnonic crystals with nanoscale sizes},

author = {Mykhaylo Sokolovskyy and Maciej Krawczyk},

url = {http://www.springerlink.com/content/9707643212r28111/},

doi = {DOI: 10.1007/s11051-011-0303-5},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Nanoparticle Research},

volume = {13},

pages = {6085-6091},

abstract = {The plane-wave method is used to determine the spin-wave spectra in nanoscale one-dimensional magnonic crystals formed by a periodic lattice of ferromagnetic stripes. The dynamic demagnetizing field in a new formulation is used in these calculations. The calculated spectra of spin waves are compared with experimental data taken from literature and a good agreement is obtained. The dependence of the spin-wave spectra on magnetic material parameters consisting of magnetic stripes is systematically studied. We proved that the experimentally found magnonic band structure with two magnonic gaps is of magnetostatic nature.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ani_dot_Py,

title = {Tunable metamaterial response of a Ni80Fe20 antidot lattice for spin waves},

author = {S Neusser and H G Bauer and G Duerr and R Huber and Sławomir Mamica and G Woltersdorf and Maciej Krawczyk and C H Back and D Grundler},

url = {http://link.aps.org/doi/10.1103/PhysRevB.84.184411},

doi = {10.1103/PhysRevB.84.184411},

year  = {2011},

date = {2011-01-01},

journal = {Physical Review B},

volume = {84},

pages = {184411},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Graczykowski2011,

title = {Surface acoustic waves and elastic constants of Cu14%Al4%Ni shape memory alloys studied by Brillouin light scattering},

author = {Bartosz Graczykowski and Bogusław Mróz and Sławomir Mielcarek and Tomasz Bręczewski and M L Nó and J San Juan},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80055080752&doi=10.1088%2f0022-3727%2f44%2f45%2f455307&partnerID=40&md5=2402276344e2ae81eecd511d7eff97d1},

doi = {10.1088/0022-3727/44/45/455307},

issn = {00223727},

year  = {2011},

date = {2011-01-01},

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

volume = {44},

number = {45},

abstract = {A single crystal Cu14%Al4%Ni shape memory alloy in austenitic phase was studied by Brillouin spectroscopy to analyse angular dispersion of Rayleigh surface waves in the planes (0 0 1) and (1 1 0). Measurements were made at room temperature using a tandem-type Fabry-Perot interferometer (JRS Scientific Instruments). Experimental results permitted determination of three independent elastic constants and anisotropic Young's modulus. In the (1 1 0) plane the pseudo-surface waves were found to occur, which - in the context of the past literature data - is unusual for cubic crystals of anisotropy coefficient higher than one. The elastic tensor components determined were used for simulation of surface phonons by the finite element method. The surface phonon velocities obtained were compared with the experimental results and the results of calculations based on the available analytical expressions for the phonon velocities for high-symmetry directions. Particular attention was paid to the relation between the elastic constants (anisotropy coefficient) and the depth of surface phonon penetration. © 2011 IOP Publishing Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kityk2011357,

title = {Optically-operated elastooptical effects in polymer matrices with nanocrystallites},

author = {I V Kityk and N Alzayed and A H Reshak and K J Pluciński and J Berdowski and I Fuks-Janczarek and R Miedziński and Zbigniew Tylczyński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859347318&doi=10.1142%2fS179360471100224X&partnerID=40&md5=c8bc687a96d92ed4bc4aa9e3f1f0349d},

doi = {10.1142/S179360471100224X},

issn = {17936047},

year  = {2011},

date = {2011-01-01},

journal = {Functional Materials Letters},

volume = {4},

number = {4},

pages = {357-359},

abstract = {We have found that the optical treatment by bicolor two laser beams at 1064 and 532 nm, at energy densities 80120 mJ/cm 2 originating from the same 10 ns Nd 3+ garnett lasers causes the occurrence of the piezooptical effect in 5080 nm γ-glicyne polymer nanocomposites at nanoparticle content about 6.5% in weighting unit. We propose to use this effect for optical triggers. © 2011 World Scientific Publishing Company.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}