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:
Mar. 10, 2009
Filed:
Sep. 24, 2004
Akihiro Inomata, Kawasaki, JP;
Antony Ajan, Kawasaki, JP;
Jun Taguchi, Kawasaki, JP;
Koji Matsumoto, Kawasaki, JP;
Wataru Yamagishi, Kawasaki, JP;
Akihiro Inomata, Kawasaki, JP;
Antony Ajan, Kawasaki, JP;
Jun Taguchi, Kawasaki, JP;
Koji Matsumoto, Kawasaki, JP;
Wataru Yamagishi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr×t−Mr×t| where Mrand Mrdenote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and tand tdenote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.