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:
Jul. 06, 2021
Filed:
Apr. 29, 2019
Fujifilm Corporation, Tokyo, JP;
Shinji Kawakami, Otokuni-gun, JP;
Sadamu Kuse, Otokuni-gun, JP;
Kenji Tanaka, Otokuni-gun, JP;
Shinji Tsujimoto, Minami-ashigara, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
The magnetic recording medium includes a non-magnetic substrate, a non-magnetic layer, and a magnetic layer, wherein the magnetic layer contains a hexagonal strontium ferrite magnetic powder, 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, 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.