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:
Jul. 17, 2001
Filed:
Jul. 26, 2000
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 thin film magnetic head and a disk storage system having a magnetic disk and the thin film magnetic head provided on a floating type slider. The thin film magnetic head has an upper magnetic core and a lower magnetic core, wherein the upper magnetic core and the lower magnetic core are made of an electroplated thin film having sufficient average crystal grain size. The upper magnetic core is made of a Ni—Fe alloy having Ni of 38 to 60 wt % and Fe of 40 to 62 wt %, and the crystal grain size is smaller than 500 Å.