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:
Aug. 24, 2010
Filed:
Jun. 04, 2007
Takumi Uesugi, Tokyo, JP;
Satoshi Miura, Tokyo, JP;
Takumi Uesugi, Tokyo, JP;
Satoshi Miura, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An exchange-coupling film incorporates an antiferromagnetic layer and a pinned layer. The pinned layer includes a first ferromagnetic layer, a second ferromagnetic layer, a third ferromagnetic layer, a nonmagnetic middle layer, and a fourth ferromagnetic layer that are disposed in this order, the first ferromagnetic layer being closest to the antiferromagnetic layer. The first ferromagnetic layer is made of a ferromagnetic material and has a face-centered cubic structure. The second ferromagnetic layer is made of only iron or an alloy containing x atomic % cobalt and (100−x) atomic % iron, wherein x is greater than zero and smaller than or equal to 60. The third ferromagnetic layer is made of an alloy containing y atomic % cobalt and (100−y) atomic % iron, wherein y is within a range of 65 to 80 inclusive. The antiferromagnetic layer and the first ferromagnetic layer are exchange-coupled to each other. The third and fourth ferromagnetic layers are antiferromagnetically coupled to each other.