CPC G11B 5/70678 (2013.01) [G11B 5/00817 (2013.01); G11B 5/714 (2013.01); G11B 5/735 (2013.01); G11B 5/584 (2013.01); G11B 5/588 (2013.01); G11B 15/43 (2013.01)] | 20 Claims |
1. A magnetic recording medium, comprising:
a base;
an underlayer that is provided over the base and includes a non-magnetic powder; and
a magnetic layer that is provided over the underlayer and includes a magnetic powder and a binder, wherein
an average particle volume V of the magnetic powder is 1600 nm3 or less,
an average thickness of the magnetic recording medium is 5.3 μm or less,
a thermal stability KuVact/kBT of the magnetic recording medium is 63 or more, and
a ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field in a perpendicular direction to a coercive force Hc1 of the magnetic recording medium in the perpendicular direction is 1.98 or less.
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