| http://www.w3.org/ns/prov#value | - The magneto-optical disk 41 comprises a substrate made of, for example, plastic, glass, or other materials in the form of a disk, and the back face of the substrate is coated with a magnetic film 41c made of Gd, Te, Fe, Co or the like, of which magnetizing direction changes according to the effect of an external magnetic field which exerts an influence on the magnetic film 41c when the temperature
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