Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1990-01-30
1992-07-21
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 365122, G11B 1304
Patent
active
051329450
ABSTRACT:
A magnetooptical recording medium provided with a first magnetic layer and a second magnetic layer having a higher Curie point and a lower coercive force than the first magnetic layer and being exchange coupled with the first magnetic layer satisfies the relation: ##EQU1## wherein H.sub.H is the coercive force of the first magnetic layer; H.sub.L is the coercive force of the second magnetic layer; M.sub.2 is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and .sigma..sub.w is the magnetic wall energy between the first and second magnetic layers and a method of recording information on the same.
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Fujii Eiichi
Kasama Nobuhiro
Kawade Hisaaki
Kobayashi Tadashi
Osato Yoichi
Canon Kabushiki Kaisha
Levy Stuart S.
Nguyen Hoa
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