US 6,388,956 B1 · Magneto-optical storage media

Abstract

A magneto-optical storage medium includes an interference layer, a magnetic domain expansion layer, an intermediate layer, a magnetic masking layer, a recording layer, and a protection layer which are sequentially formed on a substrate. The magnetic domain expansion layer produces a smaller frictional force due to wall coercivity than do the other magnetic layers. The intermediate layer has the Curie temperature TC2 which is lower than those of the other magnetic layers. The magnetic masking layer is in a perpendicular magnetization state at temperatures that are in a proximity of TC2, and changes into an in-plane magnetization state at temperatures that are higher than the proximity of TC2. The recording layer produces a higher coercive force than those produced by the magnetic domain expansion layer at room temperature.

Claims21

Dependent claims

A magneto-optical storage medium, comprising:

a recording layer in which a plurality of storage magnetic domains are formed;
a first intermediate layer for cutting off exchange coupling with the recording layer when temperature rises past a predetermined temperature;
a magnetic domain expansion layer in which magnetic walls move toward a higher temperature portion so as to form expanded magnetic domains when the first intermediate layer cuts off the exchange coupling with the recording layer;
and
a magnetic masking layer, provided between the recording layer and the first intermediate layer, that is coupled with the recording layer through an exchange force at temperatures that are not higher than the predetermined temperature, and meanwhile cuts off magnetostatic coupling of the magnetic domain expansion layer with the recording layer at temperatures that are higher than the predetermined temperature.

2 more elements

Dependencies are inferred from the claim text.

Magneto-optical storage media

Life of this patent

Magneto-optical storage media

Life of this patent

Abstract

Claims21