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:
Sep. 09, 2008
Filed:
Feb. 13, 2004
Takeshi Miki, Tokyo, JP;
Kazuhiko Fujiie, Kanagawa, JP;
Yasuhito Tanaka, Tokyo, JP;
Goro Fujita, Kanagawa, JP;
Tetsuhiro Sakamoto, Tokyo, JP;
Takeshi Miki, Tokyo, JP;
Kazuhiko Fujiie, Kanagawa, JP;
Yasuhito Tanaka, Tokyo, JP;
Goro Fujita, Kanagawa, JP;
Tetsuhiro Sakamoto, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided. The method is to manufacture a magneto-optical recording medium in which on a substratehaving groovesat least a reproduction layer and a recording layer, each of which is formed of magnetic layers, are deposited and recorded information is reproduced through domain wall displacement in the reproduction layer; and the method includes a first annealing process in which, after depositing at least the reproduction layer and recording layer on the substrateon which are formed landsand grooves, only side-wall portionsbetween adjacent landsand groovesare irradiated with laser light L, and a second magnetization annealing process in which regions including adjacent side-wall portionsand lands between side-wall portionsare irradiated with laser light Lhaving a spot diameter greater than the spot diameter of the laser light in the first annealing process, while applying an external magnetic field H.