发明名称 |
Magnetic recording medium |
摘要 |
A magnetic recording medium having more than 550 Oersted of a coercive force, less than 1.8 of a ratio of a coercive force at -196 DEG C. to a coercive force at 25 DEG C., less than 1.0 wt. % of a content of Fe2+ is prepared by incorporating a magnetic powder obtained by dispersing acicular gamma -Fe2O3 in an aqueous solution of a cobalt salt and reducing it with a reducing agent to deposit a cobalt compound on the acicular gamma -Fe2O3.
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申请公布号 |
US4302510(A) |
申请公布日期 |
1981.11.24 |
申请号 |
US19800143895 |
申请日期 |
1980.04.25 |
申请人 |
TDK ELECTRONICS CO., LTD. |
发明人 |
UMEKI, SHINJI;ONUKI, KAZUAKI;MARUTA, FUMIO |
分类号 |
G11B5/70;C09D5/23;C09D7/12;G11B5/706;G11B5/712;G11B5/842;H01F1/11;(IPC1-7):B32B5/16 |
主分类号 |
G11B5/70 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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