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:
Dec. 22, 1998
Filed:
Mar. 21, 1997
Applicant:
Inventors:
Keiji Ohkubo, Nagano, JP;
Naoki Takizawa, Nagano, JP;
Assignee:
Fuji Electric Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428141 ; 428336 ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 428900 ;
Abstract
In a magnetic recording medium in which at least Cr or Cr-alloy base layer and Co-alloy magnetic layer are formed in this order on a substrate, a seed layer is provided between the substrate and the base layer. In a preferred embodiment, the seed layer is made of a material selected from Al--Co, Cu--Si, Ni--Ga, Cu--Be, Mn--V, Ni--Zn and Fe--V each having a specific composition. Where the substrate is formed of a glass material, the base layer and magnetic layer are formed by sputtering on the substrate while the substrate is kept at a temperature of 150.degree. to 300.degree. C. and a bias voltage of -300 to 0 V is applied to the substrate.