Invention Application
- Patent Title: HEXAGONAL STRONTIUM FERRITE POWDER FOR MAGNETIC RECORDING AND MAGNETIC RECORDING MEDIUM
-
Application No.: US16008147Application Date: 2018-06-14
-
Publication No.: US20180366152A1Publication Date: 2018-12-20
- Inventor: Kenji NAOI , Masashi SHIRATA
- Applicant: FUJIFILM Corporation
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Priority: JP2017-116499 20170614
- Main IPC: G11B5/706
- IPC: G11B5/706 ; C01G49/00 ; G11B5/714 ; 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
- US11244701B2 Hexagonal strontium ferrite powder for magnetic recording and magnetic recording medium Public/Granted day:2022-02-08
Information query
IPC分类:
