The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1987
Filed:
Jun. 25, 1985
Fujio Tanaka, Tanashi, JP;
Nobutake Imamura, Kamakura, JP;
Kokusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
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.