Optomagnetic recording method and apparatus which precludes an i

Details Optomagnetic recording method and apparatus which precludes an i Optomagnetic recording method and apparatus which precludes an i

1991-12-10

1993-05-11

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365122, G11B 1304, G11B 1112, G11B 1110

Patent

active

052107248

ABSTRACT:
An information recording method, which performs recording of an information by use of an optical magnetic recording medium provided with a first magnetic layer and a second magnetic layer having higher Curie point and lower coercive force at room temperature than the first magnetic layer, by carrying out initialization to align the magnetization direction of the second magnetic layer in one direction and then irradiating an optical beam of which power has received modulation between the two values which are not zero depending on the information, thereby recording the information as the arrangement of a magnetic domain on the above medium, has characteristic such that, when initialized again after recording of the above information, an interface magnetic wall is permitted to exist between said first and second magnetic layers at the portion other than said magnetic domain.

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patent: 4151602 (1979-04-01), Haisma et al.
patent: 4198692 (1980-04-01), Kobayashi
patent: 4612587 (1986-09-01), Kaneko et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4855975 (1989-08-01), Akasaka et al.

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