Magnetooptical recording medium with overwrite capabilities and

Details Magnetooptical recording medium with overwrite capabilities and Magnetooptical recording medium with overwrite capabilities and

1994-12-02

1996-02-20

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 428694MM, G11B 1100

Patent

active

054935458

ABSTRACT:
An overwrite-capable magnetooptical recording medium is provided with high density recording and reproduction capabilities. Also provided is a high density reproduction method for use with such a recording medium. The magnetooptical recording medium includes at least three magnetic layers, wherein the first magnetic layer has an easily magnetized axis within the plane of the substrate and has a perpendicular magnetic anisotropy at temperatures above room temperature but below the Curie point of the second magnetic layer. The second magnetic layer has a perpendicular magnetic anisotropy at temperatures less than the Curie point, and the third magnetic layer has a perpendicular magnetic anisotropy from room temperature to nearly the Curie point. Each of the three layers of the recording medium satisfy the conditions T.sub.C1 >T.sub.C2 and T.sub.C2 <T.sub.C3 as well as the relationship ##EQU1## at room temperature.

REFERENCES:
patent: 5106704 (1992-04-01), Matsumoto
patent: 5132945 (1992-07-01), Osato et al.
patent: 5239524 (1993-08-01), Sato et al.
patent: 5343449 (1994-08-01), Miyata
patent: 5367507 (1994-11-01), Sato et al.

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