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. 15, 1997
Filed:
Aug. 31, 1995
Hitachi, Ltd., Tokyo, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
University of Alabama, Tuscaloosa, AL (US);
Abstract
A spin-valve read head of the giant magnetoresistive type in a data storage system has at least one magnetic thin film layer comprising a plurality of magnetic thinner film layers of ferromagnetic material with the same crystal plane orientation from one magnetic thinner film to another, and an interface between adjacent magnetic thinner films having a discontinuity in single-crystal epitaxial growth. Each magnetic thinner film layer is composed of an alloy including each of Fe, Ni and Co and has a weight ratio of Co:Fe equal to 90:10. The crystal has a crystal structure that is face centered cubic and a crystal plane orientation (111) that is highly ordered. The interfaces may be layers of Ni or Cu. The layers all exhibit a condition of magnetic orientation and annealed structure resulting from being annealed and cooled in a magnetic field sufficiently to have an anisotropic energy of the first magnetic thin film layer in an equilibrium state that is smaller than an identical structure before annealing.