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Optical Properties of a Monoclinic Insulator Cu(H₂O)₂(en)SO₄

100%
Sýkora R., Postava K., Legut D., Tarasenko R.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
469-471
EN
We compare theoretically predicted, by means of ab-initio calculations, dielectric tensor and related experimental values obtained from Mueller-ellipsometry measurements of an insulating monoclinic (optically biaxial) crystal of Cu(H₂O)₂(en)SO₄, en=C₂H₈N₂. We concentrate on the static limit, ω→ 0.
2
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Waveguiding in Thin Films with Quadratic Magneto-Optical Medium

76%
Pištora J., Domański A., Bárta O., Staněk F., Postava K., Ciprian D., Kopřiva I.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
17-23
EN
The waveguiding in thin planar structures with quadratic magneto-optical medium is analysed. The permittivity tensor elements with quadratic magneto-optical constants are specified. From synchronous condition for guided modes in layered system with magnetic ordering the dispersion relation of waveguide is presented. The reflection coefficients for s-polarized light at transversal, longitudinal, and polar configurations as incidence angle function are described. The influence of quadratic magneto-optical effect on the resonant character of the waveguiding term is described in detail. The theory covers the situation in which the optical response of the structure is linear in the amplitude of the incident wave.
3
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Magneto-Optical Study of NiFe/Au/Co/Au Layers

76%
Mazalski P., Postava K., Tekielak M., Maziewski A., Urbaniak M., Szymański B., Stobiecki F.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
369-371
EN
Sputtered NiFe/Au/Co/Au layers with noncollinear magnetizations are of scientific interest for unusual magnetization behavior and their potential application in spintronics. In this paper, we propose to use a material selective sensitivity of magneto-optical Kerr effect for separation of signals from different materials in a bilayer system. The materials selective sensitivity is demonstrated on a sample with two mutually perpendicular Co and NiFe wedges.
4
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Ellipsometric Selective Sensitivity to Magnetic Nanostructures

64%
Hamrlová J., Postava K., Životský O., Hrabovský D., Pištora J., Švec P., Janičkovič D., Maziewski A.
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issue 5
837-839
EN
Recently, we have shown that the approach of depth sensitivity of magneto-optic ellipsometry can be generalized to selectivity from different materials in nanostructures. We use the condition number as the figure of merit to quantify the magneto-optic selectivity to two different magnetic contributions in magnetic nanostructure. The method is demonstrated on nanostructures containing magnetically hard Fe particles in surface layer of soft FeNbB amorphous ribbon. We separated both magnetic contributions from measurement of hysteresis loops using magneto-optic Kerr effect in longitudinal configuration. Magneto-optic selectivity is discussed and theoretical model on the basis of effective medium is compared with experimental data of longitudinal magneto-optic Kerr effect depending on angle of incidence.
5
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Modification of Magnetic Properties of Pt/Co/Pt Films by Ga^{+} Ion Irradiation: Focused versus Uniform Irradiation

52%
Sveklo I., Mazalski P., Jaworowicz J., Jamet J., Vernier N., Mougin A., Ferré J., Kisielewski M., Zablotskii V., Bourhis E., Gierak J., Postava K., Fassbender J., Kanak J., Maziewski A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 5
1215-1226
EN
30 keV Ga^{+} irradiation-induced changes of magnetic and magneto-optical properties of sputtered Pt/Co/Pt ultrathin trilayers films have been studied as a function of the ion fluence. Out-of-plane magnetic anisotropy states with enhanced magneto-optical effects were evidenced for specific values of cobalt thickness and irradiation fluence. Results obtained after uniform or quasi-uniform focused ion beam irradiation on either out-of-plane or in-plane magnetized sputtered pristine trilayers are compared. Similar irradiation-induced magnetic changes are evidenced in quasi-uniformly focused ion beam or uniformly irradiated films, grown either by sputtering or molecular beam epitaxy. We discuss on plausible common mechanisms underlying the observed effects.
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