Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-05-01
1993-11-23
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 365122, 428694R, G11B 1304, G11B 1112, G11B 1110
Patent
active
052650731
ABSTRACT:
A magneto-optical recording medium having a first magnetic layer and a second magnetic layer having a higher curie point and a lower coercive force than those of the first magnetic layer, which magneto-optical recording medium satisfying a condition of ##EQU1## where H.sub.H is a coercive force of the first magnetic layer, H.sub.L is a coercive force of the second magnetic layer. M.sub.s is a saturation magnetization of the second magnetic layer, h is a film thickness of the second magnetic layer, and .sigma..sub.w is a magnetic wall energy between the first and second magnetic layers. The second magnetic layer contains an element which is not ferromagnetic at a room temperature. A magnetic field opposite in direction to the field of the first layer is applied to the second layer. A recording method is also present using such medium.
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Canon Kabushiki Kaisha
Nguyen Hoa T.
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