Invention Grant
- Patent Title: Magnetic recording medium
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Application No.: US17253254Application Date: 2019-10-31
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Publication No.: US11626128B2Publication Date: 2023-04-11
- Inventor: Masaru Terakawa , Minoru Yamaga
- Applicant: SONY GROUP CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SONY GROUP CORPORATION
- Current Assignee: SONY GROUP CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: K&L Gates LLP
- Priority: JPJP2019-182547 20191002
- International Application: PCT/JP2019/042704 WO 20191031
- International Announcement: WO2021/065018 WO 20210408
- Main IPC: G11B5/008
- IPC: G11B5/008 ; G11B5/73

Abstract:
An object of the present disclosure is to provide a magnetic recording medium excellent in electro-magnetic conversion characteristic and thermal stability.
The present disclosure provides a tape-shaped magnetic recording medium including: a substrate; and a magnetic layer provided over the substrate and including a magnetic powder, in which the magnetic layer has an average thickness of equal to or less than 90 nm, the magnetic powder has an average aspect ratio of from 1.0 to 3.0, the magnetic powder has an average particle volume of equal to or less than 2,300 nm3, a coercive force Hc1 in a vertical direction of the magnetic recording medium is equal to or less than 4,500 Oe, a coercive force Hc2 in a longitudinal direction of the magnetic recording medium and the coercive force Hc1 satisfy a relation of Hc2/Hc1≤0.8, and the ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field and the coercive force Hc1 is equal to or less than 2.0.
The present disclosure provides a tape-shaped magnetic recording medium including: a substrate; and a magnetic layer provided over the substrate and including a magnetic powder, in which the magnetic layer has an average thickness of equal to or less than 90 nm, the magnetic powder has an average aspect ratio of from 1.0 to 3.0, the magnetic powder has an average particle volume of equal to or less than 2,300 nm3, a coercive force Hc1 in a vertical direction of the magnetic recording medium is equal to or less than 4,500 Oe, a coercive force Hc2 in a longitudinal direction of the magnetic recording medium and the coercive force Hc1 satisfy a relation of Hc2/Hc1≤0.8, and the ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field and the coercive force Hc1 is equal to or less than 2.0.
Public/Granted literature
- US20220328066A1 MAGNETIC RECORDING MEDIUM Public/Granted day:2022-10-13
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