Abstract
A phenomenological analysis of the magnetic linear birefringence (MLB) in ferrimagnets is given in terms of a two-sublattice model (TSM). MLB has been studied in yttrium iron garnet (YIG), in gallium substituted YIG and in terbium iron garnet (TbIG) in a temperature range 80–450K in magnetic fields up to 30kG at the wavelength 1.15μ m. It has been proven that in YIG in the whole temperature range TSM is valid. In TbIG deviations from TSM has been found at low temperatures. These deviations have been related to the changes of the local symmetry of magnetic ions.
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