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Photoinduced variation of magnetic complex permeability µ=µ'-jµ'' at low frequency, e.g., 0.14 kHz is studied as a function of temperature in yttrium iron garnet (YIG). We have observed a new phenomenon in YIG occurring solely after illuminated at low temperature; photoinduced disaccommodation. We discussed an origin of the observation, taking account of the charge state of oxygen vacancy and an interaction between lattice relaxation and domain wall.

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