Over-write capable magnetooptical recording method with widened

Details Over-write capable magnetooptical recording method with widened Over-write capable magnetooptical recording method with widened

1992-09-08

1994-08-16

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 1304

Patent

active

053392981

ABSTRACT:
An over-write capable magnetooptical recording method of this invention includes the steps of: preparing an "over-write capable multi-layered magnetooptical recording medium, which consists of at least two layers including a memory layer and a writing layer, and in which the memory layer and the writing layers are exchange-coupled to each other, the direction of magnetization of the writing layer can be aligned in a predetermined direction at room temperature without changing the direction of magnetization of the memory layer, and the direction of the magnetization of the writing layer is already aligned in the predetermined direction"; rotating the medium; irradiating a laser beam onto the medium; pulse-modulating the intensity of the laser beam between a high level P.sub.H and a low level P.sub.L according to binary coded information to be recorded; and applying a bias field to the irradiation position of the laser beam. After mark formation based on the beam at the high level P.sub.H is started, the level is slightly decreased to continue the mark formation. An apparatus for embodying this method is also disclosed.

REFERENCES:
patent: 4894816 (1990-01-01), Sukeda et al.
patent: 4939717 (1990-07-01), Ohno et al.
patent: 5084857 (1992-01-01), Miyauchi et al.
patent: 5216660 (1993-06-01), Iimura
The Bell System Technical Journal, vol. 62, (Sep. 1983), pp. 1923-1936.
Japanese Journal "Optronics", 1990, No. 4, pp. 227-231.

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