发明授权
- 专利标题: Hexagonal strontium ferrite powder for magnetic recording and magnetic recording medium
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申请号: US16008147申请日: 2018-06-14
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公开(公告)号: US11244701B2公开(公告)日: 2022-02-08
- 发明人: Kenji Naoi , Masashi Shirata
- 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: JPJP2017-116499 20170614
- 主分类号: G11B5/706
- IPC分类号: G11B5/706 ; G11B5/714 ; C01G49/00 ; G11B5/708
摘要:
Provided is hexagonal strontium ferrite powder for magnetic recording, in which an activation volume is 800 to 1,500 nm3, a content of rare earth atom with respect to 100 atom % of iron atom is 0.5 to 5.0 atom %, and a rare earth atom surface portion uneven distribution is provided.
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