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. 06, 2009
Filed:
Jun. 29, 2005
Kouichi Nishioka, Kanagawa, JP;
Satoshi Shigematsu, Kanagawa, JP;
Yasunari Tajima, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Exchange coupling energy between an anti-ferromagnetic layer and a first ferromagnetic layer, and an anti-ferromagnetic coupling energy between the first ferromagnetic layer and a second ferromagnetic layer by way of an Ru anti-ferromagnetic coupling layer of a spin valve device are increased thereby increasing the magnetoresistance ratio and decreasing the coercivity of the free layer of the spin valve film. In an MnPt anti-ferromagnetic bottom type synthetic ferri-type spin valve film in which an underlayer, an anti-ferromagnetic layer comprising MnPt, a first ferromagnetic layer comprising CoFe, an anti-ferromagnetic coupling layer comprising Ru, a second ferromagnetic layer comprising CoFe, an intermediate non-magnetic layer comprising Cu, a free layer comprising synthetic films of CoFe and NiFe and a protective layer are stacked over a substrate, the Fe composition X in CoFeX of the first ferromagnetic layer is set as about: 20<x≦50 at %.