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:
Apr. 13, 2004
Filed:
Nov. 29, 2001
Yasuhito Tanaka, Tokyo, JP;
Yoshihiro Muto, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magneto-optical recording medium for recording and reproducing carriers by laser beam irradiation includes a first magnetic layer which is magnetized in the in-plane direction at room temperature and is perpendicularly magnetized at a predetermined temperature T or more; a second magnetic layer which is in contact with the first magnetic layer, has a Curie temperature Tc higher than the predetermined temperature T , and has in-plane magnetic anisotropy up to the Curie temperature Tc ; a third magnetic layer which has a Curie temperature Tc higher than the predetermined temperature T and has perpendicular magnetic anisotropy at least in a predetermined range of a temperature distribution of the magneto-optical recording medium during laser beam irradiation when reproducing; and a rare earth metal layer formed between the third magnetic layer and the second magnetic layer.