Abstract

A phenomenological description of magnetic birefringence is given in terms of spin-dependent electronic polarizability of the crystals. In more details is discussed the birefringence in cubic magnetic crystals, where the effect can be described by three magneto-optical coefficients ρ11, ρl2 et ρ44. The experimental study of magnetic birefringence has been performed in yttrium and rare-earth iron garnets. For the description of the results the ratio a = (2 ρ44(ρ 11-ρ12)-1 was introduced. The value of a characterizes magneto-optical anisotropy of the crystal.

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