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:
Dec. 09, 2003
Filed:
Dec. 02, 2002
Masaaki Sano, Hitachi, JP;
Yoshiaki Kita, Hitachinaka, JP;
Shun-ichi Narumi, Hitachi, JP;
Takashi Kawabe, Odawara, JP;
Moriaki Fuyama, Hitachi, JP;
Hisashi Takano, Kodaira, JP;
Hisano Yamamoto, Hachiouji, JP;
Kenzo Masuda, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic disk apparatus includes a magnetic disk for recording information and a magnetic head which has a reproducing head and a recording head. The reproducing head comprising a lower shield film, a magnetoresistive film, a pair of electrodes and an upper shield, and the recording head comprising an upper magnetic core, a lower magnetic core, and a coil disposed between said upper magnetic core and said lower magnetic core. The upper magnetic core and the lower magnetic core include an electroplated thin film with an average crystal grain size smaller than 500 Å, and the electroplated thin film is made of Ni—Fe alloy of which Ni is 38 to 60 wt % and Fe is 40 to 62 wt %.