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. 05, 2016
Filed:
Dec. 28, 2010
Shigenobu Koyama, Nagoya, JP;
Kaori Imaeda, Nagoya, JP;
Shigenobu Koyama, Nagoya, JP;
Kaori Imaeda, Nagoya, JP;
Daido Tokushuko Kabushiki Kaisha, Aichi, JP;
Abstract
The present invention provides a thin-film magnetic sensor including: a giant magnetoresistive film having a giant magnetoresistive effect, and thin-film yokes each composed of a soft magnetic material and electrically connected to both ends of the giant magnetoresistive film, in which each of the thin-film yokes includes an outer yoke which is composed of a first soft magnetic material and is provided outward with respect to the giant magnetoresistive film and an inner yoke which is composed of a second soft magnetic material and is provided between the giant magnetoresistive film and the outer yoke; the first soft magnetic material is composed of a crystalline or microcrystalline soft magnetic material; the thin-film magnetic sensor is obtained by (1) forming the each outer yoke, the giant magnetoresistive film and the each inner yoke in this order, and (2) performing a heat treatment for improving soft magnetic characteristics of the each outer yoke before forming the giant magnetoresistive film; and a length Lof the each inner yoke satisfies the following equation (a) and equation (b):≧1  (a)×100/()≦50  (b)where tis a thickness of the each outer yoke, and Lis a length of the each outer yoke.