| 摘要 |
PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD THEREOF The present invention provides a perpendicular magnetic recording medium and a manufacturing method thereof with which the formation of a domain wall in a soft magnetic backing layer relative to a large external magnetic field can be suppressed more favorably than in the related art, the Hk of the backing layer can be further improved, and productivity can be increased. In the perpendicular magnetic recording medium and the manufacturing method thereof, a 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 comprising a soft magnetic lower backing layer, a non-magnetic metal layer, and a soft magnetic upper backing layer, and 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. Selected Drawing:
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