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:
Apr. 18, 2006
Filed:
Sep. 11, 2003
Takayoshi Ohtsu, Fujisawa, JP;
Satoshi Shigematsu, Fujisawa, JP;
Kouji Nishioka, Fujisawa, JP;
Takao Imagawa, Fujisawa, JP;
Kouji Kataoka, Fujisawa, JP;
Masatoshi Arasawa, Fujisawa, JP;
Norifumi Miyamoto, Fujisawa, JP;
Takayoshi Ohtsu, Fujisawa, JP;
Satoshi Shigematsu, Fujisawa, JP;
Kouji Nishioka, Fujisawa, JP;
Takao Imagawa, Fujisawa, JP;
Kouji Kataoka, Fujisawa, JP;
Masatoshi Arasawa, Fujisawa, JP;
Norifumi Miyamoto, Fujisawa, JP;
Hitachi Global Storage Technologies Japan, Ltd., Odawara, JP;
Abstract
A magnetoresistive head comprises a free magnetic layer that has first and second free magnetic films sandwiching a non-magnetic intermediate film therebetween, the respective magnetizing directions of the first and the second free magnetic films are antiparallel. The length of the free magnetic layer in the direction of the track width is 200 nm or less, and a difference between a product of saturation magnetic flux density and a film thickness of the first free magnetic film, and that of the second free magnetic film is within a range from 1 to 3 nmT. By this structure, the variation of output and the variation of asymmetry is greatly decreased at a track width of 200 nm or less.