Abstract
The magnetic and magnetooptical (MO) properties of Er x Y 3− x Fe 5O 12 ( x=0.4, 1.5, and 2.5) single crystals have been presented and compared to those of pure ErIG. Faraday rotation (FR) spectra obtained in energy region 5500–13 000 cm −1 with a high optical resolution has been presented here, in contrast to other researches of the Faraday rotation performed at 1152 nm. The investigations have been provided at 5, 130, and 295 K temperatures under magnetic field up to 20 kOe applied parallel to the [1 1 1] crystallographic axis of the crystals. It was employed as an effective means of modifying the exchange interaction between the rare earth (RE) and the two Fe sublattices: diamagnetic (yttrium) ions substitution in the dodecahedral { c} sublattice. It was discovered that both magnetic and MO properties were greatly affected by yttrium substitution.
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