发明授权
- 专利标题： Hexagonal ferrite magnetic particle and method of manufacturing the same, and magnetic recording medium
- 专利标题（中）： 六方铁素体磁粉及其制造方法及磁记录介质
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申请号： US13077250申请日： 2011-03-31
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公开(公告)号： US08545714B2公开(公告)日： 2013-10-01
- 发明人: Hiroyuki Suzuki , Nobuo Yamazaki
- 申请人： Hiroyuki Suzuki , Nobuo Yamazaki
- 申请人地址： JP Tokyo
- 专利权人： FUJIFILM Corporation
- 当前专利权人： FUJIFILM Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Sughrue Mion, PLLC
- 优先权： JP2010-083612 20100331; JP2010-233775 20101018
- 主分类号： H01F1/11
- IPC分类号： H01F1/11
摘要：
An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic particle comprising melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material; subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment; collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on Al2O3 conversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle.
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