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:
Mar. 16, 2004
Filed:
Mar. 19, 2002
Go Mori, Nara, JP;
Naoyasu Iketani, Tenri, JP;
Michinobu Mieda, Shiki-gun, JP;
Akira Takahashi, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
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 T 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 T , and changes into an in-plane magnetization state at temperatures that are higher than the proximity of T . The recording layer produces a higher coercive force than those produced by the magnetic domain expansion layer at room temperature.