Spatial light modulations (SLM) utilizing magneto-optical (MO) effect of magnetic materials are expected to offer fast switching and small pixel size as small as wavelength of the light. However, the small MO effect is a major issue. In this paper, we report a thermomagnetic recording of highly bismuth-substituted garnet film, known for large Faraday effects. Y 0.5 Bi 2.5 Fe 4 GaO 12 (Bi,Ga:YIG) film with a Faraday rotation of -4.66 degrees was used as an MO medium. A laser scanning thermomagnetic recording system using Galvanometer mirror was developed and the size and quality of recorded magnetic domains were investigated. The smallest recorded magnetic domain diameter was 0.62 μm with a small standard deviation of 0.09 μm. Line patterns with a width of 1 µm can be recorded in this film. We found that Bi,Ga:YIG films have potential as a material for SLMs with fast switching, submicron pixel size and large MO effect.
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Sakaguchi et al. (2024) studied this question.
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