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:
Jun. 27, 2000
Filed:
Feb. 17, 1998
Applicant:
Inventors:
Kouji Shimazawa, Nagano, JP;
Masanori Sakai, Nagano, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G11B / ;
U.S. Cl.
CPC ...
324210 ; 324537 ;
Abstract
A method of testing a magnetic head with a spin-valve MR element having a pinned direction, includes a step of reproducing magnetic information recorded on a magnetic medium by the spin-valve MR element of the magnetic head to be tested to generate a reproduced signal, the information being recorded on the magnetic medium by using a rectangular wave current with a predetermined pattern, and a step of judging whether the pinned direction of the spin-valve MR element is correct in accordance with a relationship between wave shape of the reproduced signal and the predetermined pattern.