发明名称 |
Magnetic recording medium. |
摘要 |
<p>A magnetic recording medium which comprises a substrate and a magnetic layer comprising hexagonal system barium ferrite powder of the formula: BaO.n[Fe2-(a+b+c+d)CoaNibZncTidO3+e] (I) wherein n is a number of 5.5 to 6.0, a through d are each a number of 0.01 to 0.2 and satisfy the equation: (a+b+c)/d = 1 to 10 and e is a number of -0.3 to 0.01, and a non-magnetic particulate powder having a Mohs' hardness of not smaller than 7 in an amount of 1 to 30 % by weight based on the weight of said ferrite powder, in which demagnetization by cooling is suppressed.</p> |
申请公布号 |
EP0309981(A2) |
申请公布日期 |
1989.04.05 |
申请号 |
EP19880115863 |
申请日期 |
1988.09.27 |
申请人 |
HITACHI MAXELL LTD. |
发明人 |
KISHIMOTO, MIKIO;KITAHATA, SHIN'ICHI |
分类号 |
C09D5/23;G11B5/706;G11B5/708 |
主分类号 |
C09D5/23 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|