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:
Sep. 09, 1997
Filed:
Oct. 24, 1994
Hiroyuki Suzuki, Kawasaki, JP;
Yoshihiro Shiroishi, Hachioji, JP;
Sadao Hishiyama, Sayama, JP;
Tomoyuki Ohno, Kokubunji, JP;
Yotsuo Yahisa, Fuchu, JP;
Yoshibumi Matsuda, Kokubunji, JP;
Norikazu Tsumita, Kanagawa-ken, JP;
Masaki Ohura, Odawara, JP;
Takaaki Shirakura, Chigasaki, JP;
Noriyuki Shige, Odawara, JP;
Kazumasa Takagi, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic recording medium for longitudinal recording with a low media noise, a high S/N ratio and high reliabilities in corrosion resistance is disclosed. By making a magnetic layer from a Co-based alloy comprising 1 to 35 at. % of at least one element selected from the group consisting of Pt and Ir, 1 to 17 at. % of at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ge and Si, except for Si, whose concentration is 1 to 40 at. %, and 0.1 to 10 at. % of oxygen, a magnetic recording medium for longitudinal recording having an inplane coercivity of 1,200 Oe or more and a coercive squares of not more than 0.85 is obtained.