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Magneto-optical effects in nanostructures BixY3-xFe5O12/r-Al2O3
Russian version
Telegin A.V. 1, Sukhorukov Yu. P. 1, Lobov I. D. 1, Naumov S. V. 1, Korkh Yu. V. 1, Dubinin S.S.1, Merencova K.A. 1, Artemiev M.S.1, Nosov A.P. 1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: telegin@imp.uran.ru, suhorukov@imp.uran.ru, korkh@imp.uran.ru
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Ultrathin films of yttrium-iron garnets with bismuth (BixY3-xFe5O12) on sapphire substrates (r-Al2O3) have been synthesized by magnetron sputtering. The spectral dependences of the Faraday effect and the polar Kerr effect in BixY3-xFe5O12/r-Al2O3 thin-film nanostructures are considered. The dispersion of the Verdet constant and the polar Kerr effect for a substrate made of monocrystalline diamagnetic r-Al2O3 has been measured. The spectral and field dependences of the Faraday and Kerr rotations of BixY3-xFe5O12 films have been determined. It is shown that the diamagnetic transparent substrate r-Al2O3 makes a weak contribution to the magneto-optical characteristics of thin-film nanostructures. The presence of magnetic inhomogeneities as a result of island growth of BixY2Fe5O12 films on r-Al2O3 is accompanied by a significant decrease in the magnitude of the Faraday and Kerr effects. At the same time, the magnitude of the effects in the BixY3-xFe5O12 films grown on r-Al2O3 still is the same order to that of BiY2Fe5O12 films on garnet substrates, which opens up prospects for wider use of BixY3-xFe5O12/r-Al2O3 structures either for research purposes or for practice. Keywords: Faraday effect, Kerr effect, Verdet constant, ferrite garnet, sapphire, magnetic inhomogeneities, thin films.
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