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. 25, 2001
Filed:
Dec. 03, 1998
Ishiwata Nobuyuki, Tokyo, JP;
Hisanao Tsuge, Tokyo, JP;
Hisao Matsutera, Tokyo, JP;
Yuji Tsukamoto, Tokyo, JP;
Masafumi Nakada, Tokyo, JP;
Atsushi Kamijo, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention provides a magneto-resistance effect (hereinafter, referred to as MR) type composite head. The head includes a reproduction head including an MR element arranged between a first and a second magnetic shield; and a recording head arranged next to the reproduction head so as to use the second magnetic shield as a first magnetic pole film and having a second magnetic pole film opposing to the first magnetic pole via a magnetic gap; the MR element including: a center region including a ferromagnetic tunnel junction magneto-resistance effect film (hereinafter, referred to as a TMR film) having: a first ferromagnetic layer and a second ferromagnetic layer for generating a magneto-resistance effect using the first and the second magnetic shields as electrodes so that a current flows in a an almost vertical direction between the first and the second magnetic shields; and a tunnel barrier layer provided between the first and the second ferromagnetic layer; and an end region arranged to sandwich the center region from both sides for applying a bias magnetic field to the center region.