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:
Jan. 04, 2022
Filed:
Apr. 13, 2018
Applicant:
Sony Corporation, Tokyo, JP;
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/706 (2006.01); G11B 5/712 (2006.01); G11B 5/714 (2006.01); H01F 1/03 (2006.01); H01F 1/36 (2006.01); H01F 1/24 (2006.01);
U.S. Cl.
CPC ...
G11B 5/706 (2013.01); G11B 5/70642 (2013.01); G11B 5/712 (2013.01); G11B 5/714 (2013.01); C01P 2004/84 (2013.01); C01P 2006/42 (2013.01); H01F 1/03 (2013.01); H01F 1/24 (2013.01); H01F 1/36 (2013.01);
Abstract
Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ε iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.