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. 09, 2002
Filed:
Jan. 21, 1999
Matthew R. Gibbons, Livermore, CA (US);
Marcos Lederman, San Francisco, CA (US);
Read-Rite Corporation, Milpitas, CA (US);
Abstract
A dual symmetric spin valve sensor consists of outer ferromagnetic pinned layers which are pinned by a current induced magnetic field. One of the outer pinned layers is magnetically coupled to an inner pinned layer which is pinned so that the magnetization of the other outer and the inner pinned layers are in the same direction. This provides the magnetization for the free layer disposed between the two layers to properly use the spin valve effect. The ferromagnetic layers are separated by conductor layers. The pin layers are synthetic antiferromagnetic layers consisting of the two layers tightly interlayer exchange coupled. The field induced by the sense current pins the pinned layers.