| 发明名称 |
Magnetic recording medium having a magnetic layer comprising hexagonal barium ferrite magnetic particles containing tin and magnesium in specified proportions |
| 摘要 |
Disclosed herein is a magnetic recording medium having a magnetic layer comprising hexagonal ferrite magnetic particles each expressed as BaOxFe12-x-ySnxMgyO18 (where, 0.55</=x</=0.88, 0.71</=y</=1.05). The hexagonal ferrite magnetic particles contained in this magnetic layer each have Sn and Mg partially substituted for Fe, the Sn and Mg being perfectly solid-soluble, thus being capable of providing hexagonal ferrite magnetic particles which are superior in crystalline properties and small in variation of composition. As a result, the coercivity distribution can be made further sensitive, both the self demagnetization and recording demagnetization in the short wave-length range can be reduced, and a higher reproducing output characteristic is attainable in the high density recording range.
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| 申请公布号 |
US5114801(A) |
申请公布日期 |
1992.05.19 |
| 申请号 |
US19900571093 |
申请日期 |
1990.08.21 |
| 申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
AOKI, NOBUYUKI;OCHIAI, KEIICHI;KOMODA, HIDEAKI |
| 分类号 |
G11B5/706 |
主分类号 |
G11B5/706 |
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