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AssigneeCanon Kabushiki Kaisha
InventorTsutomu Shiratori
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A magneto-optical recording medium consists of a plurality of magnetic layers, and at least one of the plurality of magnetic layers always maintains a magnetization orientation state in which magnetization is oriented in a given direction in a region, where the recording mark string is formed, on a central portion of a recording track, and magnetization is oriented in a direction anti-parallel to the given direction in regions at two sides of the region, where the recording mark string is formed, on side portions of the recording track. With this arrangement, even when recording laser power fluctuates or a tracking control error occurs during an optical modulation over-write operation, generation of an unerased portion of initially recorded information can be suppressed.
A magneto-optical recording medium having at least first and second magnetic layers and being capable of overwriting a recording mark string recorded in a recording region of said first magnetic layer by using (i) a first kind of recording process in which the direction of magnetization of the first magnetic layer is oriented in a direction that is stable with respect to an exchange-coupling force of the second magnetic layer, which has been initialized, by a heating/cooling process in which the medium is heated to a first temperature, and (ii) a second kind of recording process in which the direction of magnetization of the second magnetic layer is reversed by a heating/cooling process in which the medium is heated to a second temperature and thereafter the direction of magnetization of the first magnetic layer is oriented in a direction that is stable with respect to the exchange-coupling force of the second magnetic layer,
Dependencies are inferred from the claim text.