Abstract
Results of investigations of magnetoelectric effects in substances with a ferrimagnetic ordering are reported. The consideration is performed on the example of yttrium iron garnet (YIG) belonging to the space group O 10h . In the unit cell of the crystal structure of YIG, the magnetic Fe ions occupy 16 positions of the a type and 24 positions of the d type. It is shown that the magnetoelectric effects in YIG can be described in the model of three (rather than 20) magnetic sublattices, namely M a, M d1 and M d2. The magnetization vector M a is determined by Fe ions located in a positions. The Fe ions in d positions are located in two sublattices (d1 and d2) related by a symmetry center. In such a three-sublattice model of a two-position ferrimagnet, one more branch (antimagnon) appears in the spectrum apart from two ferromagnon branches. The third branch is caused by vibrations of only antiferromagnetism vector L = M d1 − M d2. This branch is associated with changes in the dielectric permittivity and refraction index of the ferrimagnetic medium that are responsible for the magnetoelectric effects.
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Original Russian Text © E.A. Turov, M.I. Kurkin, V.V. Men’shenin, V.V. Nikolaev, 2007, published in Fizika Metallov i Metallovedenie, 2007, Vol. 103, No. 5, pp. 473–479.
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Turov, E.A., Kurkin, M.I., Men’shenin, V.V. et al. Dynamics of a collinear two-position multisublattice ferrimagnet in a three-sublattice model as applied to yttrium iron garnet. Phys. Metals Metallogr. 103, 446–452 (2007). https://doi.org/10.1134/S0031918X07050031
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DOI: https://doi.org/10.1134/S0031918X07050031