Over write capable magnetooptical recording medium

Details Over write capable magnetooptical recording medium Over write capable magnetooptical recording medium

1991-08-20

1996-12-17

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428684MM, 428684EC, 428900, 360131, 360135, 365122, 369 13, 369121, G11B 566

Patent

active

055852009

ABSTRACT:
An overwritable method of magnetooptical recording uses an over write capable magnetooptical recording medium that comprises a substrate and a magnetic layer. The magnetic layer is stacked on the substrate and includes first and second layers each having a perpendicular magnetic anisotropy. When a high-level laser beam irradiates the medium, the magnetization of the second layer is reversed and a bit of one magnetization direction is recorded in the first layer under the influence of the magnetization of the second layer. When a low-level laser beam irradiates the medium, a bit of opposite magnetization direction is recorded in the first layer under the influence of the second layer. This overwritable method of magnetooptical recording exhibits a high C/N ratio without decreasing recording sensitivity.

REFERENCES:
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patent: 4753853 (1988-06-01), Sato et al.
patent: 4855975 (1989-08-01), Akasaka et al.
patent: 5239534 (1993-08-01), Matsumoto
Saito et al, "Direct Overwrite By Light Power Modulation on Magnetooptical Multi-Layered Media", Jap. J. App. Phys., vol. 26, Sep. 16, 1987, Supplement 26-4 pp. 155-159.
Kobayashi et al. "Magnetization Process of Exchange-Coupled Ferrimagnetic Double-Layered Films" Jap. J. App. Phys. vol. 20 No. 11 Nov., 1981 pp. 2089-2095.
The Bell System Technical Journal, Sep. 1983, vol. 62, No. 7, Part 1, pp. 1923-1936.

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