Photoinduced magnetic anisotropy and optical dichroism have been studied in silicon-doped YIG at cryogenic temperatures. These effects belong to a new class of magneto-optical effects in which the overlap properties of the excited states of ions on different sites are important. The spectral variation of the photoinduced dichroism shows the position of the operative Fe+ + state to be at about 10 000 cm−1. Photoinduced torque studies are interpreted to indicate that a large fraction of the Fe+ + ions may be moved among various sets of inequivalent sites on irradiation by intense white light.
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Dillon et al. (1970) studied this question.
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