Features of optical anisotropy of europium and terbium iron garnets

摘要

The results of investigation of magnetic linear birefringence (MLB) and magnetic linear dichroism of Tb_3Fe_5O_(12) (TbIG) iron garnet (IG) on ~7F_6-~7F_0 and ~7F_6-~7F_1 optical transitions and Eu_3Fe_5O_(12) (EuIG) iron garnet on ~7F_0-~7F_6 at the variation of the directions of the magnetization vector / relative to the electric vector £ linearly polarized light that propagates through single crystal iron garnets are presented. The measurements were made on Tb_3Fe_5O_(12) and Eu_3Fe_5O_(12) single-crystal samples in the form of plates 100 µm thick cut in the (110) and (100) plane a temperature of T=82K and in a magnetic field H = 22 kOe. The absorption spectra of the linearly polarized light were studied. It is shown that MLB and dichroism in the region of the ~7F_6-~7F_0 and ~7F_0-~7F_6 absorption bands reach values 10~(-3). The nonreci-procity of MLB spectra and dichroism with the change of the relative orientation of the magnetization vector / and the light wave vector is first experimentally discovered. This effect may be used as a base for the design of the different transducers such as a magnetooptical optical channels commutator.