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:
May. 03, 1994
Filed:
Nov. 16, 1992
Applicant:
Inventors:
Daniel A Nepela, San Jose, CA (US);
Erich P Valstyn, Los Gatos, CA (US);
Assignee:
Read-Rite Corporation, Milpitas, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360113 ;
Abstract
A read/write head includes a dual element MR sensor and a superimposed inductive head. In an implementation of the invention, the MR sensor structure includes two spaced magnetoresistive (MR) elements on which antiferromagnetic (AFe) thin films, preferably of iron manganese, are deposited. The AFe thin films act as exchange bias layers with the MR elements, biasing the MR layers in opposite directions and perpendicular to the surface of a magnetic medium. Recorded magnetic signals are sensed differentially and the output signal is characterized by increased amplitude and improved signal-to-noise ratio.