Photo-magnetic semiconductor using pyromagnetic effect

A photomagnetic semiconductor (PMS), composed of a thick film magnetic semiconductor and a radiant flux absorbent, is described. The PMS with a thickness of 55 mu m is made of a ferrite powder and a ruthenium compound and its surface is painted with a radiant flux absorbent. The PMS is a pyromagnetic film utilizing the temperature dependence of the magnetic reluctance. When visible rays are radiated to the PMS, the radiant flux absorbent captures the light energy and transfers thermal energy to the magnetic semiconductor, which causes the reluctance change of the PMS. Therefore, the PMS acts as a nonwinding photomagnetic transducer. The PMS is suitable for use as a photosensor, a photorelay, a photochopper, or an exposure meter.<
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