Overwrite-capable magnetooptical recording medium allowing enlar

Details Overwrite-capable magnetooptical recording medium allowing enlar Overwrite-capable magnetooptical recording medium allowing enlar

1991-09-09

1994-05-03

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 13, 369288, 360 59, G11B 724, G11B 1304

Patent

active

053094271

ABSTRACT:
A medium comprises a first layer consisting of perpendicularly magnetizable magnetic film functioning as a memory layer, a second layer consisting of perpendicularly magnetizable magnetic film functioning as a writing layer, if necessary, a third layer as a switching layer, and a fourth layer consisting of perpendicularly magnetizable magnetic film functioning as an initializing layer, the first to fourth layers being sequentially stacked, wherein the first and second layers are exchange-coupled, a direction of magnetization of only the second layer can be aligned in a predetermined direction without changing a direction of magnetization of the first layer at a room temperature, and the second and fourth layers are exchange-coupled at a temperature equal to or lower than a Curie temperature of the third layer. The medium of the present invention also comprises a thermal diffusion layer adjacent to the fourth layer.

REFERENCES:
patent: 4466035 (1984-08-01), Connell et al.
patent: 4586092 (1986-04-01), Martens et al.
patent: 4658388 (1987-04-01), Ishiwatari et al.
patent: 5018119 (1991-05-01), Aratani et al.
"The Bell System Technical Journal", vol. 62, (1983), pp. 1923-1936.

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