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:
Jun. 07, 2005
Filed:
Aug. 14, 2002
Akira Morinaga, Odawara, JP;
Koichi Nishioka, Hiratsuka, JP;
Takayoshi Ohtsu, Oi, JP;
Norifumi Miyamoto, Chigasaki, JP;
Shuichi Kojima, Hiratsuka, JP;
Akira Morinaga, Odawara, JP;
Koichi Nishioka, Hiratsuka, JP;
Takayoshi Ohtsu, Oi, JP;
Norifumi Miyamoto, Chigasaki, JP;
Shuichi Kojima, Hiratsuka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The invention provides a magnetic domain controlling structure wherein a lamination stack Madjacent to a magnetoresistive stack of a GMR, CPP-GMR or TMR magnetic head has at least two magnetic filmsandanti-ferromagnetically coupled through a non-magnetic film, or the lamination stack Mdisposed on the end portions of the free layer of the magnetoresistive stack of the GMR magnetic head has a magnetic layer anti-ferromagnetically coupled to the free layerthrough the non-magnetic film. Ferromagnetic film deposition dead zone area problems and the consequent problem of film rippling in free layer portions that reduces element sensitivity are prevented, as is the problem of increased error from read drift in the magnetic field exchange coupling method, resulting in a highly stable, highly sensitive MR head with no loss of magnetic field intensity.