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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. Source


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. Source

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