Method of recording at least ternary data on optomagnetic record

Details Method of recording at least ternary data on optomagnetic record Method of recording at least ternary data on optomagnetic record

1989-03-27

1990-07-03

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 369116, G11B 1112, G11B 1304

Patent

active

049389157

ABSTRACT:
A method of recording at least ternary data on an optomagnetic recording medium having at least a first magnetic layer, and a second magnetic layer whose Curie temperature is higher than that of the first magnetic layer and which is capable of being magnetization inverted independently of the first magnetic layer, the method including the steps of aligning directions of magnetization of the first and second magnetic layers of the medium in a predetermined direction; and radiating a single light beam whose power is adjusted in accordance with the data so as to obtain one of a first level, a second level higher than the first level, and a third level lower than the first and second levels, while applying a bias magnetic field in a direction opposite to the predetermined direction, wherein only the direction of the first magnetic layer of the medium is inverted when a power of the light beam is in the first level, the directions of the first and second magnetic layers are inverted when the power of the light beam is in the second level, and the directions of the first and second magnetic layers are not inverted when the power of the light beam is in the third level.

REFERENCES:
patent: 4151602 (1979-04-01), Haisma et al.
patent: 4202022 (1980-05-01), Imamura et al.
patent: 4556291 (1985-12-01), Chen
patent: 4612587 (1986-09-01), Kaneko et al.
patent: 4701881 (1987-10-01), Tanaka et al.
Nikon, "Magneto-Optic Memories Begin to Look Like a Good Bet", Electroncs/Apr. 16, 1987, p. 33.
Tanaka, the Japanese Patent Abstract, vol. 6, No. 34, p. 104 (912), Mar. 2, 1982.
Mizutani (I), the Japanese Patent Abstract, vol. 9, No. 86, p. 349 (1809), Apr. 16, 1985.
Mizutani (II), the Japanese Patent Abstract, vol. 9, No. 8, p. 349 (1809), Apr. 16, 1985.

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