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. 20, 2015
Filed:
Dec. 19, 2011
Shinji Kawakami, Ibaraki, JP;
Sadamu Kuse, Ibaraki, JP;
Kenji Tanaka, Ibaraki, JP;
HITACHI MAXELL, LTD., Ibaraki-Shi, Osaka, JP;
Abstract
The magnetic recording medium of the present invention comprises: a non-magnetic substrate; a non-magnetic layer formed on one of principal surfaces of the non-magnetic substrate; and a magnetic layer formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate. Mr and t satisfy 0.0020 μT·m≦Mr·t≦0.0150 μT·m, where Mr is the residual magnetic flux density of the magnetic layer, and t is the average thickness of the magnetic layer, Lsatisfies 2 nm≦L≦6 nm, where Lis the average thickness of a first mixed layer that is formed on the surface of the magnetic layer opposite to the non-magnetic layer, and Lsatisfies 0.1≦L/t≦0.45, where Lis the average thickness of a second mixed layer that is formed on the surface of the magnetic layer facing the non-magnetic layer.