G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 11/105 (2006.01)
Patent
CA 2134927
A magnetooptical recording medium includes a reproduction layer, a first recording layer and a second recording layer. The reproduction layer is a perpendicular magnetic film in both a state of room temperature and a state of temperature rise. In the first and second recording layers, sub lattice magnetic moments of the same kinds of elements constituting the first and second recording layers are oriented in opposite directions. In reproducing operation, an initialization magnetic field is applied to a portion of the recording medium other than a light beam irradiated portion. A direction of magnetization of the reproduction layer is oriented in a stable direction with respect to magnetization of the first recording layer by an exchange coupling effect in a region at a temperature not less than a middle temperature in the irradiated portion. The direction of magnetization of the reproduction laye22r is oriented in a direction of the initialization magnetic field in a low-temperature region. Reproduction of information is effected by detecting a magnetooptical change in light reflected by the recording medium.
Canon Kabushiki Kaisha
Ridout & Maybee Llp
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