Magnetooptical recording method

Details Magnetooptical recording method Magnetooptical recording method

1992-11-13

1994-10-04

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

053532660

ABSTRACT:
Magnetooptical recording is effected simultaneously with an overwriting operation. A magnetooptical recording medium to be used in this method is provided with a first magnetic layer having a Curie temperature T.sub.1 and a coercive force H.sub.1, and a second magnetic layer having a Curie temperature T.sub.2 higher than the Curie temperature T.sub.1 and a coercive force H.sub.2 smaller than the coercive force H.sub.1. The first and second magnetic layers satisfy a predetermined condition. The second magnetic layer is solely initialized by use of an initializing magnetic field. After the initialization of the second magnetic layer, the medium is irradiated with a light beam. A magnetic field modulated according to recording information is applied to the portion irradiated with the light beam. A reflected light generated upon the irradiation of the light beam in the irradiation step is detected to reproduce the information recorded in the light beam irradiating portion. Then, it is confirmed whether the information has been correctly recorded on the recording medium on the basis of the recording information reproduced in the reproducing step.

REFERENCES:
patent: 4878132 (1989-10-01), Aratani et al.
patent: 4937799 (1990-06-01), Hashimoto et al.
patent: 4955007 (1990-09-01), Aratani et al.
patent: 5132945 (1992-07-01), Osato et al.
patent: 5218581 (1993-06-01), Ohta et al.

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