Title:
磁気記録媒体
Document Type and Number:
Japanese Patent JP6981503
Kind Code:
B2
Abstract:
A tape-shaped magnetic recording medium includes a base, a nonmagnetic layer that is provided on the base and contains a nonmagnetic powder, and a magnetic layer that is provided on the nonmagnetic layer and contains a magnetic powder. In the magnetic recording medium, the magnetic layer has an average thickness of not more than 90 nm, the magnetic powder has an average aspect ratio of from 1.0 to 3.0, a coercive force Hc1 in a perpendicular direction is not more than 3,000 Oe, the coercive force Hc1 in the perpendicular direction and a coercive force Hc2 in a longitudinal direction satisfy the relation of Hc2/Hc1≤0.8, the nonmagnetic layer has an average thickness of not more than 1.1 μm, and the nonmagnetic powder has an average particle volume of not more than 2.0×10−5 μm3.
Inventors:
Jun Terakawa
Minoru Yamaga
Katsunori Maejima
Minoru Yamaga
Katsunori Maejima
Application Number:
JP2020100148A
Publication Date:
December 15, 2021
Filing Date:
June 09, 2020
Export Citation:
Assignee:
Sony Group Corporation
International Classes:
G11B5/70; G11B5/584; G11B5/706; G11B5/714; G11B5/73; G11B5/78; G11B15/43
Domestic Patent References:
| JP2017224365A | ||||
| JP2011096312A | ||||
| JP9320031A | ||||
| JP2002367150A |
Foreign References:
| WO2019160144A1 |
Attorney, Agent or Firm:
Masatomo Sugiura
Takuma Sugiura
Takuma Sugiura
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