Invention Grant
- Patent Title: Hexagonal strontium ferrite powder for magnetic recording and magnetic recording medium
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Application No.: US16008147Application Date: 2018-06-14
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Publication No.: US11244701B2Publication Date: 2022-02-08
- Inventor: Kenji Naoi , Masashi Shirata
- Applicant: FUJIFILM Corporation
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JPJP2017-116499 20170614
- Main IPC: G11B5/706
- IPC: G11B5/706 ; G11B5/714 ; C01G49/00 ; G11B5/708
Abstract:
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.
Public/Granted literature
- US20180366152A1 HEXAGONAL STRONTIUM FERRITE POWDER FOR MAGNETIC RECORDING AND MAGNETIC RECORDING MEDIUM Public/Granted day:2018-12-20
Information query
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