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:
Oct. 24, 2000
Filed:
Nov. 16, 1998
Applicant:
Inventors:
Yukari Nihei, Miyagi, JP;
Takashi Tamura, Miyagi, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
4286 / ; 428692 ; 428900 ; 501 10 ; 501 69 ; 501 73 ; 360126 ;
Abstract
A nonmagnetic substrate includes NiO, TiO.sub.2, ZnO, and CaO as major constituents, and major ilmenite and spinel structures, in which the percentage of the total area of the ilmenite and spinel crystalline domains occupied in the area of a given cross section of the nonmagnetic substrate is 20% or more. Preferably, the remainder of the area of the cross section, other than the ilmenite and spinel crystalline domain, contains a CaTiO.sub.3 phase and a TiO.sub.2 phase.