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:
Dec. 21, 2004
Filed:
Aug. 06, 2002
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In accordance with the present invention, in a magnetic recording medium for perpendicular magnetic recording, a recording characteristic which is not inferior to that of double-layer medium and a resolution of reproduction which is not inferior to that of single layer medium are provided. On a non-magnetic substrate, a soft magnetic layer for increasing a perpendicular component of recording magnetic field in a perpendicular magnetic recording layer is formed. A non-magnetic layer for suppressing extension of signal magnetic field loop from recording magnetization in the perpendicular magnetic recording layer is formed on the soft magnetic layer. The perpendicular magnetic recording layer is formed on the non-magnetic layer. The non-magnetic layer has a thickness required to effectively reduce the signal magnetic field loop. The required thickness exceeds 20 nm.