Magneto-optical memory device whereon overwriting operation can

Details Magneto-optical memory device whereon overwriting operation can Magneto-optical memory device whereon overwriting operation can

1992-10-23

1995-06-13

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369277, 3692752, 360114, G11B 1100

Patent

active

054250080

ABSTRACT:
A magneto-optical memory device is provided with a recording track having a recording film and a guide track wherein a perpendicular magnetic film, whose magnetization direction is arranged in one direction, is formed, the recording track and the guide track being alternatively disposed. A recording operation is carried out using a circular magnetic field generated from the perpendicular magnetic film by projecting a light beam only on the recording track so as to raise the temperature of the recording film. When erasing, the light beam is projected on the recording track and respective portions of the guide tracks located on both sides of the recording track so as to raise the temperature thereof. As the temperature rises, the magnetization of the perpendicular magnetic film becomes smaller, and an erasing operation is therefore performed using an external magnetic field.

REFERENCES:
patent: 4778747 (1988-10-01), Ohta et al.
patent: 4801499 (1989-01-01), Aoyama et al.
patent: 4853912 (1989-08-01), Akasaka et al.
patent: 4985881 (1991-01-01), Saito et al.
"Direct Overwrite by Light Power Modulation on Magneto-Optical Double-Layered Media" (The 53rd study meeting by the Magnetic Society of Japan, 1988, pp. 87-92).
"Direct Overwrite by Leakage Field Modulation of the Thermo-Magnetic Biasing Layer", (Proceedings of Magneto-Optical Recording International Symposium '91, J. Magn. Soc. Jpn., vol. 15, Supplement No. S1(1991), pp. 315-318).

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