| 摘要 |
According to one embodiment, disclosed is a perpendicular magnetic recording medium in which a magnetic recording layer has a stacked structure including a hard magnetic recording layer and soft magnetic recording layer each having magnetic crystal grains and a grain boundary region. The magnetic crystal grains in the hard magnetic recording layer contain Co and Pt, have the hcp structure, and are orientated in the (0001) plane. The magnetic recording layer has a residual squareness ratio of 0.95 or less and an irreversible reversal magnetic field of 0 Oe or less on a magnetization curve when a magnetic field perpendicular to the substrate surface is applied.
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