- 专利标题： ϵ-iron oxide type ferromagnetic powder and magnetic recording medium
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申请号： US15825469申请日： 2017-11-29
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公开(公告)号： US11090716B2公开(公告)日： 2021-08-17
- 发明人: Masashi Shirata , Takashi Fujimoto
- 申请人： FUJIFILM Corporation
- 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： JP2016-233609 20161130
- 主分类号： B22F1/00
- IPC分类号： B22F1/00 ; G11B5/706 ; H01F1/06
摘要：
Provided is an ε-iron oxide type ferromagnetic powder with a ratio Hc173K/Hc296K between a coercive force Hc173K measured at a temperature of 173 K and a coercive force Hc296K measured at a temperature of 296 K is higher than 1.00 and less than 2.00, and a magnetic recording medium containing the ε-iron oxide type ferromagnetic powder in a magnetic layer.
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