Light-induced magnetic effects in an insulating spin glass

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Abstract
We report on the photoinduced magnetic phenomena in an insulating spin glass, the cobalt alumino silicate glass (13.3 at. % Co) below its freezing temperature Tf =5 K. In particular the illumination of the sample by near infrared radiation speeds up the relaxation of the thermoremanent magnetization, and enhances significantly the magnetic susceptibility near and below Tf. We proposed a simple phenomenological model which explains why the magnetic metastability is strongly affected by light illumination. The temperature and magnetic field dependence of the photomagnetic effects are also discussed.