发明授权
- 专利标题： Hexagonal ferrite magnetic powder, method for producing the same and magnetic recording medium
- 专利标题（中）： 六方铁氧体磁粉，其制造方法和磁记录介质
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申请号： US11155591申请日： 2005-06-20
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公开(公告)号： US07381482B2公开(公告)日： 2008-06-03
- 发明人: Nobuo Yamazaki , Masatoshi Takahashi , Akira Manabe , Hiroyuki Suzuki
- 申请人： Nobuo Yamazaki , Masatoshi Takahashi , Akira Manabe , Hiroyuki Suzuki
- 申请人地址： JP Chiba JP Tokyo
- 专利权人： Asahi Techno Glass Corporation,FUJIFILM Corporation
- 当前专利权人： Asahi Techno Glass Corporation,FUJIFILM Corporation
- 当前专利权人地址： JP Chiba JP Tokyo
- 代理机构： Sughrue Mion, PLLC
- 优先权： JPP.2004-182598 20040621
- 主分类号： G11B5/716
- IPC分类号： G11B5/716
摘要：
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 28 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m), a switching field distribution (SFD) of from 0.3 to 0.7 and a D70/D50 of from 1.05 to 1.25. This magnetic powder can be obtained by melting and quenching starting materials to obtain an amorphous product, and thermally treating the product, which comprises increasing a temperature at a rate of 300 to 500° C./hr in a temperature range of 550 to 600° C. in the thermal treatment before the temperature reaches the thermally treating temperature.
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