CPC G11B 5/667 (2013.01) [G11B 5/653 (2013.01); G11B 5/70642 (2013.01); G11B 5/712 (2013.01); G11B 5/73919 (2019.05); H01F 1/147 (2013.01)] | 15 Claims |
1. A magnetic recording medium having a recording track width of 2 μm or less, comprising:
a recording layer containing a powder of particles containing ε iron oxide, wherein
a squareness ratio measured in a transport direction is 30% or less,
a squareness ratio S1 measured in the transport direction and a squareness ratio S2 measured in a width direction satisfy a relationship S1≥S2,
a coercive force is 230 kA/m or greater and 300 kA/m or less at 25° C.,
an activation volume is 8000 nm3 or less, and
in a switching field distribution (SFD) curve, a peak ratio X/Y of a main peak height X and a height Y of a sub-peak near zero magnetic field is 3.0 or greater.
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