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Features of the Faraday and Kerr magneto-optical effects in nanoscale Y3Fe5O12 films and Gd3Ga5O12, Nd3Ga5O12 substrates
Russian version
Sukhorukov Yu. P. 1, Telegin A. V. 1, Lobov I. D. 1, Korovin A. M. 2
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2Ioffe Institute, St. Petersburg, Russia
Email: suhorukov@imp.uran.ru, telegin@imp.uran.ru, i_lobov@imp.uran.ru, Amkorovin@mail.ioffe.ru
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The Faraday and Kerr magneto-optical effects for ultra-thin films of yttrium iron garnet Y3Fe5O12 and monocrystalline substrates Gd3Ga5O12 and Nd3Ga5O12 were studied in the visible spectrum range 1.3<E<4.5 eV in fields up to 1 T. Verdet constants for the substrates Gd3Ga5O12 and Nd3Ga5O12 were determined, and features of the Faraday and Kerr effects spectra related to the magneto-optical properties of the substrates for Y3Fe5O12/Gd3Ga5O12 and Y3Fe5O12/Nd3Ga5O12 structures were identified. It was shown that, by excluding the contribution from the substrates, the spectral and field dependencies of the magneto-optical effects in nanoscale films correspond to the data for bulk Y3Fe5O12. An estimation of the relaxation layer was carried out, and it was shown that nanoscale films, being comparable in thickness to the critical layer, can possess a specific Faraday rotation (~15-20 deg/μm) close to that of bulk materials, demonstrating the high quality of the obtained samples. Keywords: Faraday Effect, Kerr Effect, Magneto-optics, YIG (Yttrium Iron Garnet), Films, Interface.
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