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:
Aug. 04, 1998
Filed:
Apr. 26, 1995
Junichi Nakai, Kobe, JP;
Kazuo Yoshikawa, Kobe, JP;
Eisuke Kusumoto, Kobe, JP;
Hiromi Matsumura, Kobe, JP;
Takashi Miyamoto, Kobe, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Abstract
Disclosed is magnetic recording media having a high coercivity sufficient to cope with the recent high density recording, low noise property and excellent squareness, and a target for forming a magnetic film useful for realizing the magnetic recording media. The magnetic film is made of a Co based alloy containing: Cr in an amount of 8-18 atomic %; one kind or more of elements selected from a group consisting of V, Mo and W in an amount of 3-10 atomic %, or one kind or more of the elements and Ta in an amount of 3-10 atomic %; Pt in an amount of 0.5 to 20 atomic % or Ni in an amount of 5-30 atomic %, as needed; and the balance being Co and inevitable impurities, wherein the total content of Cr and one kind or more of the elements selected from a group consisting of V, Mo and W, or of Cr and one kind or more of the elements and Ta is specified to be 24 atomic % or less. A target for forming the magnetic film is formed by melting, casting and hot-rolling the Co alloy having the above composition, and it has a maximum permeability of 100 or less.