| 摘要 |
A perpendicular magnetic recording medium is disclosed. The formation of a domain wall in a soft magnetic backing layer relative to a large external magnetic field can be suppressed better in the medium, the Hk of the backing layer is improved, and productivity can be increased. The perpendicular magnetic recording medium is formed by laminating at least a soft magnetic backing layer, a non-magnetic underlayer, a magnetic recording layer, and a protective film in succession on a non-magnetic substrate. The backing layer, underlayer, magnetic recording layer, and protective film are formed by a vapor deposition method. The backing layer is a laminated body with a soft magnetic lower backing layer, non-magnetic metal layer, and soft magnetic upper backing layer. The non-magnetic metal layer is formed by forming a metal layer and then subjecting the metal layer to surface exposure processing using a nitrogen-containing gas containing 0.1 to 100 at % nitrogen.
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