Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1985-06-25

1987-10-20

Moffitt, James W.

Static information storage and retrieval

Information masking

Polarization

360135, G11C 1142

Patent

active

047018810

ABSTRACT:
A magneto-optical recording medium is disclosed in which a magnetic thin film recording layer is formed by a magnetic material having a Curie temperature or magnetic compensation temperature as low as 50.degree. to 250.degree. C. and a coercive force as large as 1 KOe or more and having an easy axis of magnetization perpendicularly to the film surface. A substantially transparent magnetic material film layer of ferrite, garnet or the like is disposed adjacent the recording film layer, large in the Faraday rotation angle and having an easy axis of magnetization perpendicularly to the film surface. A transparent substrate is disposed on the side of incidence of light. The substantially transparent magnetic material layer of the ferrite, garnet or the like may increase the magneto-optical rotation angle in the magnetic thin film recording layer, or may increase the magneto-optical rotation angle by the Faraday effect. The thickness of the substantially transparent magnetic material layer is selected in such a region where the figure of merit .sqroot.R.multidot..theta..sub.k expressed by its reflectivity R and the magneto-optical rotation angle .theta..sub.k is maximum.

REFERENCES:
patent: 4126494 (1978-11-01), Imamura et al.
patent: 4559573 (1985-12-01), Tanaka et al.
patent: 4586092 (1986-04-01), Martens et al.
patent: 4645722 (1987-02-01), Katayama

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