Abstract
Bulk dense samples of nanostructured yttrium iron garnet Y3Fe5O12 with crystallite sizes of 20–40 nm are prepared by high-pressure torsion from a garnet powder with micron grains. The absorption and Faraday rotation spectra in the IR range and the transverse Kerr effect spectra in the visible spectral range for these samples are measured. The absorption and magneto-optical effect spectra are in agreement with the corresponding spectra of single crystals. The appearance of additional absorption bands at 2 and 3 μm is associated with the violation of the stoichiometry of the nanogarnet and the possible contamination of the initial material. The specific Faraday rotation in the transparency window is approximately 1.5 times smaller than the corresponding quantity for single crystals. The extrema in the Kerr effect spectra coincide with those for single crystals, are smaller in magnitude, and are smeared. On the whole, the prepared bulk samples are transparent in the IR spectral range and exhibit optical and magneto-optical characteristics comparable to the corresponding parameters for single crystals. The high density of point defects of the nanogarnet is primarily due to the violation of the stoichiometry and the valence state of iron ions.
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Original Russian Text © B.A. Gizhevskiĭ, Yu.P. Sukhorukov, E.A. Gan’shina, N.N. Loshkareva, A.V. Telegin, N.I. Lobachevskaya, V.S. Gaviko, V.P. Pilyugin, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 9, pp. 1729–1734.
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Gizhevskiĭ, B.A., Sukhorukov, Y.P., Gan’shina, E.A. et al. Optical and magneto-optical properties of nanostructured yttrium iron garnet. Phys. Solid State 51, 1836–1842 (2009). https://doi.org/10.1134/S1063783409090121
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DOI: https://doi.org/10.1134/S1063783409090121