Abstract
Photoinduced decrease in magnetic initial permeability below 20 kHz is observed at 77 K in yttrium iron garnet (YIG) single crystal with a small amount of Ga (0.0625) and some oxygen deficiency. On warming the previously illuminated sample with a white light, the complex permeability was found to show the photoinduced disaccommodation and triple peaks of the imaginary part of permeability, μ" as a function of temperature. Furthermore, it is observed that each peak of μ" depends on the illuminating time. These features are discussed and interpreted, based on a modified “two center” model.
