Reproduction-only magneto-optical disk with selectively exchange

Details Reproduction-only magneto-optical disk with selectively exchange Reproduction-only magneto-optical disk with selectively exchange

1992-12-01

1995-01-24

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369288, 360 59, G11B 1110, G11B 1304

Patent

active

053847580

ABSTRACT:
A reproduction-only magneto-optical disk has first and second magnetic layers. First micro areas .alpha..sub.0 where an exchange coupling force acts between the two magnetic layers, and second micro areas .alpha..sub.1 where no exchange coupling force acts between the two magnetic layers are formed in the disk. Either or both of the two kinds of micro areas serve as information units, and information is expressed by the presence/absence or length of the information units. The two magnetic layers are exchange-coupled to each other at a temperature not more than Curie Temperatures of the two layers, and directions of magnetization of the magnetic layers can be aligned at room temperature in a state wherein an interface magnetic wall is formed between the two magnetic layers in each first micro area. A disk reproduction method and a reproduction apparatus are also provided.

REFERENCES:
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5168482 (1992-12-01), Aratani et al.
patent: 5235569 (1993-08-01), Matsumoto et al.
J. Saito, M. Sato, H. Matsumoto, H. Akasaka, "Direct Overwrite by Light Power Modulation of Magneto-Optical Multi-Layered Media", Japanese Journal of Applied Physics, vol. 26, No. 4, 1987, pp. 155-159.
Patent Abstracts of Japan, vol. 16, No. 209, May, 1992; and JP-A-40 34 744, Feb. 1992.

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