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A spin-glass state up to 210 K has been found in (Mg, Fe){Mg,Fe,Ti}2O4 spinel ferrite thin films formed on α-Al2O3(0001) substrates. The films exhibit long-time relaxation of the magnetization in zero-field-cooled operation below 210 K; also, the ac susceptibility measurements show the presence of frequency-dependent cusp temperature. Both of the above observations are characteristic features of a spin glass. The change of magnetic state in the films from a spin glass to ferrimagnet has been achieved over a wide temperature range below 160 K by means of light irradiation.
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Muraoka et al. (2000) studied this question.
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