Magneto-optical disk having a magnetic film with two layers and

Details Magneto-optical disk having a magnetic film with two layers and Magneto-optical disk having a magnetic film with two layers and

1994-02-16

1995-07-04

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, G11B 1304

Patent

active

054306957

ABSTRACT:
A magneto-optical disk having at least two magnetic layers stacked on a substrate. The magnetism of both of these magnetic layers exchange coupled at temperatures below the curie points of both layers, where primary micro-regions .alpha..sub.0 are provided in which the magnetic wall produced between the magnetic layers is canceled by the magnetic inversion of the primary magnetic layer, and secondary micro-regions .alpha..sub.1 are provided in which the magnetic wall produced between the magnetic layers is canceled by the magnetic inversion of the secondary magnetic layer. One of the micro-regions is considered the informational unit, and the presence/absence and/or length of this informational unit expresses the information stored on the disk. As a result, there is no problem of information being lost when the disk is accidentally exposed to an excessive magnetic field or when the disk is exposed to abnormally high temperatures.

REFERENCES:
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5163031 (1992-11-01), Osato
patent: 5235569 (1993-08-01), Matsumoto et al.
patent: 5239524 (1993-08-01), Sato et al.
patent: 5355354 (1994-10-01), Matsumoto et al.

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