A magneto-optical disk is an optical disk in which information can be recorded and erased. A magnetic film having large coercivity and perpendicular to uniform magnetization is plated on the substrate of the disk. The magnetization amount of each microdomain can form two kinds of information states. The disc uses two kinds of magnetic field modulation and replication technology for recording. It can adopt a very advanced binary digital recording format. It reads out according to the Kerr magneto-optic effect and requires an optical path system and a photodetector.
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