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. 14, 2008
Filed:
Mar. 11, 2004
Hisashi Umeda, Higashine, JP;
Iwao Okamoto, Higashine, JP;
Hisashi Umeda, Higashine, JP;
Iwao Okamoto, Higashine, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magnetic recording medium is provided with an exchange layer structure, and a magnetic layer provided on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer and a nonmagnetic coupling layer provided on the ferromagnetic layer, where the ferromagnetic layer and the magnetic layer are exchange-coupled and having mutually antiparallel magnetizations. The ferromagnetic layer and the magnetic layer satisfy a relationship Hc'≧Hc′, where Hc′ denotes a dynamic coercivity of the ferromagnetic layer and Hc′ denotes a dynamic coercivity of the magnetic layer.