Abstract
Room-temperature spin-glass states have been found in (Mg,Fe){Mg,Fe,Ti}2O4 spinel ferrite thin films formed on Al2O3(0001) and SrTiO3(111) substrates. This elevated-temperature spin-glass state has been achieved by the fine tuning of spin states through the control of composition, random oxygen deficiencies, and the stress induced by the film/substrate lattice mismatch in the ferrite films. We have demonstrated the change of magnetic state by means of light irradiation from spin glass to a ferrimagnet over a wide range of temperatures below 290 K. The direct photoexcitation of spins with photon energy of 2.0 eV, which corresponds to the spin excitation energy for Fe ions, is the most effective for realizing photoinduced magnetization.
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