Crimean Federal Vi Vernadsky University

Simferopol’, Ukraine

Crimean Federal Vi Vernadsky University

Simferopol’, Ukraine
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Seleznyova K.,French National Center for Scientific Research | Seleznyova K.,Crimean Federal Vi Vernadsky University | Sergeev N.A.,University Of Szczecin | Olszewski M.,University Of Szczecin | And 4 more authors.
Solid State Nuclear Magnetic Resonance | Year: 2017

A comparative analysis of the Czjzek's and Maurer's models of the joint distribution density of NMR quadrupole parameters has been carried out in view of their application to account for spectra broadening induced by local disorder in crystals. As an example of such an application, we have considered Magic Angle Spinning NMR of 11B and 71Ga isotopes in polycrystalline gallium borate. Computer simulations carried out using both models unambiguously show that in the case of low local disorder the Maurer's model, in contrast to the Czjzek's model, provides satisfactory fits to experimental NMR spectra. © 2017 Elsevier Inc.


Seleznyova K.,French National Center for Scientific Research | Seleznyova K.,Crimean Federal Vi Vernadsky University | Strugatsky M.,Crimean Federal Vi Vernadsky University | Kliava J.,French National Center for Scientific Research
European Journal of Physics | Year: 2016

The claim that the model of a pair of fictitious magnetic charges, described in our recent paper, is that of an infinitely thin solenoid is a mistake, mainly based on misinterpretation of certain figures therein. © 2016 IOP Publishing Ltd.


Berzhansky V.N.,Crimean Federal Vi Vernadsky University | Filippov D.M.,Crimean Federal Vi Vernadsky University | Lugovskoy N.V.,Crimean Federal Vi Vernadsky University
Physics Procedia | Year: 2016

Some important features of magneto-optic eddy current (MOEC) images realized in garnet films during introscopy process and behavior of domain structure in these films were revealed and are discussed. Numerical simulations of eddy current magnetic fields were performed with parameters of the real sample. It is established that the experimental results are in a qualitative agreement with the numerical simulations. © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.


Zamkovskaya A.,Crimean Federal Vi Vernadsky University | Maksimova E.,Crimean Federal Vi Vernadsky University
Journal of Physics: Conference Series | Year: 2016

This paper presents the method for the calculation of anisotropic piezoelectric properties of single crystals and the graphical display of the results in 3 D. Crystallographic preferred orientations were determined for piezoelectric modules and electromechanical coupling factor, which measures the ability of a material to interconvert electrical and mechanical energy.


Seleznyova K.,French National Center for Scientific Research | Seleznyova K.,Crimean Federal Vi Vernadsky University | Strugatsky M.,Crimean Federal Vi Vernadsky University | Kliava J.,French National Center for Scientific Research
European Journal of Physics | Year: 2016

Three different models of a magnetic dipole, viz., a uniformly magnetised sphere, a circular current loop and a pair of fictitious magnetic charges, have been systematically analysed within the formalism based on the vector potential of the magnetic field. The expressions of the potentials and magnetic fields produced by each dipole model have been obtained. A computer code has been put forward in order to visualise magnetic field lines for different dipole models. It has been shown that the magnetic field outside the uniformly magnetised sphere coincides with that of a point dipole. The other two models give considerably different results at distances small or intermediate in comparison with the dipole size. © 2016 IOP Publishing Ltd.


Yagupov S.,Crimean Federal Vi Vernadsky University | Strugatsky M.,Crimean Federal Vi Vernadsky University | Seleznyova K.,Crimean Federal Vi Vernadsky University | Seleznyova K.,French National Center for Scientific Research | And 7 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2016

We report the first successful synthesis of iron borate films. FeBO3 films on GaBO3 single crystal substrates have been prepared by a liquid phase epitaxy route. In order to determine optimal crystallization regimes, a series of experiments has been carried out. Electron microscope studies have allowed monitoring different phases of the film formation. The compositions of the film and of the substrate have been determined by energy-dispersive spectroscopy. X-ray diffraction analysis has allowed an accurate determination of a mismatch between the lattice parameters of the film and of the substrate. Electron magnetic resonance studies of the FeBO3 film confirm the existence of magnetic ordering. The values of the effective Dzyaloshinskii field as well as the Néel temperature are in good accordance with those previously determined for FeBO3 single crystal. © 2016 Elsevier B.V.

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