Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-09-06
1992-11-17
Nguyen, Hoa
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, 3692752, 369288, 369272, 418694, G11B 1304, G11B 1110, G11B 1112
Patent
active
051649268
ABSTRACT:
A medium comprises a memory layer, a writing layer, a switching layer, and an initializing layer, these four layers consisting of perpendicularly magnetizable magnetic films being stacked in order, wherein the memory layer and the writing layer are exchange-coupled, a direction of magnetization of only the writing layer can be aligned in a predetermined direction without changing a direction of magnetization of the memory layer, and the writing layer and the initializing layer are exchange-coupled via the switching layer at a temperature equal to or lower than the Curie temperature of the switching layer. The writing layer is RE-rich at room temperature and has compensation temperature between room temperature and its Curie temperature, and the initializing layer is RE-rich at room temperature and has no compensation temperature between room temperature and its Curie temperature.
REFERENCES:
"The Bell System Technical Journal", vol. 62, (1983), pp. 1923-1936.
Nguyen Hoa
Nikon Corporation
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