Thermomagnetic recording method applying power modulated laser o

Details Thermomagnetic recording method applying power modulated laser o Thermomagnetic recording method applying power modulated laser o

1987-08-20

1990-09-04

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1114, G11B 1304

Patent

active

049550071

ABSTRACT:
Thermomagnetic recording method using a thermomagnetic recording medium having a superposed layer of magnetically coupled first and second magnetic thin films is disclosed. The magnetic thin film includes a portion where the respective magnetic moments of the first and second thin films are coupled in opposite directions to each other. The method comprises heating the superposed layer in a first heating state in which the superposed layer is heated at a temperature T.sub.1 which is higher than the Curie temperature T.sub.C1 of the first magnetic thin film and will not cause the inversion of the magnetic moment of the second magnetic thin film or in a second heating state in which the superimposed layer is heated at a temperature T.sub.2 which is higher than the Curie temperature T.sub.C1 and is high enough to cause the inversion of the magnetic moment of the second magnetic thin film by modulating heating condition according to an information signal to be recorded; and forming recording magnetization on the thermomagnetic recording medium by cooling the heated superimposed layer of the thermomagnetic recording medium. In the method, real-time overwriting information can be achieved without using a modulated external magnetic field.

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Nizutani (I), The Japanese Patent Abstract, vol. 9, No. 86, p. 349, Apr. 16, 1985.
Tanaka, The Japanese Patent Abstract, vol. 6, No. 34, p. 104, Mar. 02, 1982.

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