Magneto-optic memory device for overwriting information on magne

Details Magneto-optic memory device for overwriting information on magne Magneto-optic memory device for overwriting information on magne

1992-08-24

1994-10-18

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 1304

Patent

active

053574931

ABSTRACT:
In a magneto-optic memory device for recording information on a magneto-optic recording medium having a magneto-optic recording film irradiated by a first small diameter light spot and a second larger diameter light spot which is substantially concentric with the first light spot, the temperature of a portion of the recording film around a recording position is changed by the irradiation of the second light spot in accordance with an information signal to be recorded, between a temperature, which is lower than a compensation temperature of the recording film and produces spontaneous magnetization of the recording film having intensity necessary for recording information, and a temperature which is higher than the compensation temperature of the recording film and produces spontaneous magnetization of the recording film having intensity necessary for recording information, and the intensity of the first light spot is increased to raise the temperature of the recording position of the recording film so as to reach near the Curie temperature of the recording film, thereby erasing old information and recording new information at the same time.

REFERENCES:
patent: 4539662 (1985-09-01), Hatano et al.
patent: 4549287 (1985-10-01), Hatano et al.
patent: 4771413 (1988-09-01), Nago
patent: 4853912 (1989-08-01), Akasaka et al.
patent: 4944037 (1990-07-01), Ando
patent: 5208799 (1993-05-01), Nakao et al.

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