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. 01, 1991
Filed:
May. 01, 1990
Kunihiko Mizumoto, Yamaguchi, JP;
Hirokazu Kejiura, Ootake, JP;
Yuji Togami, Tokyo, JP;
Nobuo Saito, Tokyo, JP;
Mitsui Petrochemical Industries, Ltd., Tokyo, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Abstract
Magnetooptical recording media according to the present invention are disclosed. By virtue of comprising films of Nd-Dy-Co, Nd-M-Fe or Nd-M-Fe-Co alloy system (in which M denotes Tb, Dy or Ho) having a magnetic easy axis perpendicular to the film, the present magnetooptical recording media have such advantages that there is not any fear of lowering magnetic properties owing to the oxidation of the alloy films, and that there is no need of heating substrates when said alloy films are intended to be formed on the substrates. Accordingly, these alloy films can be formed even on such substrates composed of organic materials such as plastics. Moreover, magnetooptical recording media which comprise the alloy films in accordance with the present invention have excellent magnetic properties such as perpendicular magnetic, anisotropic energy in direction normal to the film, coercive force and saturation magnetization, particularly in point of coercive force.