发明授权
- 专利标题: Magnetic recording medium
- 专利标题(中): 磁记录介质
-
申请号: US497280申请日: 1983-05-23
-
公开(公告)号: US4511617A公开(公告)日: 1985-04-16
- 发明人: Shozo Hideyama , Akio Ishizawa , Katuya Kumagai , Minoru Hashimoto
- 申请人: Shozo Hideyama , Akio Ishizawa , Katuya Kumagai , Minoru Hashimoto
- 申请人地址: JPX Kawasaki
- 专利权人: Tokyo Shibaura Denki Kabushiki Kaisha
- 当前专利权人: Tokyo Shibaura Denki Kabushiki Kaisha
- 当前专利权人地址: JPX Kawasaki
- 优先权: JPX57-87348 19820525
- 主分类号: C09C1/48
- IPC分类号: C09C1/48 ; C09D5/23 ; C09D7/12 ; G11B5/706 ; G11B5/716 ; G11B5/738 ; H01F1/11 ; G11B5/70 ; B32B7/02
摘要:
Disclosed is a magnetic recording medium which comprises; a substrate; a first magnetic layer applied on the surface of the substrate and having an easy axis of magnetization in the in-plane direction of the substrate; and a second magnetic layer applied on the surface of the first magnetic layer, formed of ferrite series powder represented by the formula;AO.n(Fe.sub.1-m M.sub.m).sub.2 O.sub.3(wherein A is at least one metallic element selected from the group consisting of Ba, Sr, Pb and Ca; M is at least one substituent component selected from the group consisting of Co, Ti, Ni, Mn, Cu, Zn, In, Ge and Nb; m is 0.08 to 0.2; and n is 5.4 to 6.0), and having an easy axis of magnetization in a direction perpendicular to the plane of the substrate; said first magnetic layer having a surface resistivity of 1.times.10.sup.2 to 1.times.10.sup.8 .OMEGA.. In another embodiment, a conductive layer having a surface resistivity of 1.times.10.sup.7 .OMEGA. or smaller may be interposed between the substrate and the first magnetic layer.
公开/授权文献
信息查询