Abstract
A photoinduced decrease in permeability μ′ is observed over 90% in a highly pure single crystal of yttrium-iron-garnet (YIG) grown by a floating zone method. Even after the illumination is removed, the influence remains up to 230 K. By annealing under oxygen atmosphere in the preparation stage, the magnitude of the effect is reduced to 40%. On warming after the sample is illuminated by a flash lamp at 77 K, the imaginary part of permeability μ″ below 10 kHz is found to show the double peaks, activation energies of which are 0.1 and 0.3 eV, respectively. Besides, it has been observed that the dependence of magnitude of each peak on the strength of illumination is different. These features are discussed in terms of one or two electron F-type defects (oxygen vacancy) and photoexcited two levels.
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