- Patent Title: Magnetic recording medium having controlled coercive force ratio
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Application No.: US16609993Application Date: 2018-04-13
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Publication No.: US11217277B2Publication Date: 2022-01-04
- Inventor: Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
- Applicant: Sony Corporation
- Applicant Address: JP Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JP Tokyo
- Agency: K&L Gates LLP
- Priority: JPJP2017-091269 20170501
- International Application: PCT/JP2018/015510 WO 20180413
- International Announcement: WO2018/203468 WO 20181108
- Main IPC: G11B5/706
- IPC: G11B5/706 ; G11B5/712 ; G11B5/714 ; H01F1/03 ; H01F1/36 ; H01F1/24

Abstract:
Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ε iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.
Public/Granted literature
- US20200066302A1 MAGNETIC RECORDING MEDIUM Public/Granted day:2020-02-27
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