Photoinduced Irreversible Effects on Magnetic Properties and Allied Phenomena in Magnetic Oxides VI

Photoinduced variation of magnetic complex permeabilities μ\u27 and μ" as a function of temperature or time is reviewed in yttrium iron garnet which has been studied in our laboratories. Our basic idea is; when the oxygen vacancies are made empty by photoexcitation, the resulting perturbation is larger than when this vacancy has one or two electrons. New data and the further discussion based on the localized and band model are also described

PHOTOINDUCED IRREVERSIBLE EFFECTS ON MAGNETIC PROPERTIES AND ALLIED PHENOMENA IN MAGNETIC OXIDES VII

Photoinduced irreversible change in an optical absorption α was observed for a bulk single crystal and a thin film of yttrium-iron garnets (YIG) over the spectral range 600 or 700-2000nm and over the temperature range 80-200K. The observation is discussed based on a local structural change induced by an irradiation