Magneto-optic recording medium, magneto-optic recording system a

Details Magneto-optic recording medium, magneto-optic recording system a Magneto-optic recording medium, magneto-optic recording system a

1990-10-02

1994-11-29

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304, G11B 1112, G11B 1110

Patent

active

053696280

ABSTRACT:
A magneto-optic recording medium has a cartridge provided with a magnetization direction indicating portion for indicating the direction of magnetization of a second magnetic layer. Alternatively, the direction of magnetization of the second magnetic layer is recorded in advance in the first magnetic layer. The direction of magnetization of the second magnetic layer indicated or recorded is detected and recognized. A magnetic field oriented in an opposite direction to the direction of magnetization detected is imparted to the magneto-optic recording medium. Alternatively, predetermined information is recorded in the first magnetic layer, the direction of magnetization of the second magnetic layer is detected on the basis of a signal reproducing that information, and the direction of a magnetic field to be applied to the magneto-optic recording medium is set on the basis of the direction of magnetization thus detected. In addition, the direction of the magnetic field to be applied to the magneto-optic recording medium is set and the output of a light beam is changed on the basis of the direction of the second magnetic layer detected.

REFERENCES:
patent: 4688203 (1987-08-01), Koishi et al.
patent: 4740937 (1988-04-01), Watanabe
patent: 4855975 (1989-08-01), Akasaka et al.
patent: 4878132 (1989-10-01), Aratani et al.
patent: 5043960 (1991-08-01), Nakao et al.
patent: 5077714 (1991-12-01), Katayama et al.
Iida et al, "Recording Power Characteristics of 130 mm overwritable MO Disk by Laser Power Modulation Method", Japanese Journal of Applied Physics, vol. 1989, suplement 38-3, pp. 367-370.

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