Magneto-optical recording medium having a layer that retains its

Details Magneto-optical recording medium having a layer that retains its Magneto-optical recording medium having a layer that retains its

1994-04-25

1995-09-12

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 502, G11B 1100

Patent

active

054503825

ABSTRACT:
A magneto-optical recording medium has at least a first magnetic layer and a second magnetic layer which are mutually exchange-coupled. The first magnetic layer has a compensation temperature within a range higher than a room temperature but lower than the Curie temperature of the second magnetic layer. Under the application of an external magnetic field of a suitable intensity to the recording medium, the magnetization of the first magnetic layer is oriented in a stable direction with respect to the external magnetic field at the room temperature. At the vicinity of the compensation temperature of the first magnetic layer, the magnetization of the first magnetic layer is oriented in a stable direction with respect to the exchanging-coupling with the second magnetic layer. The second magnetic layer maintains a predetermined magnetization state at any temperature from the room temperature to the compensation temperature of the first magnetic layer regardless of the presence or absence of the external magnetic field.

REFERENCES:
patent: 4771347 (1988-09-01), Horimai et al.
patent: 5132945 (1992-07-01), Osato et al.
patent: 5187694 (1993-02-01), Ichihara et al.
patent: 5224080 (1993-06-01), Ohtsuki

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