Perpendicular magnetic recording medium and a manufacturing method for the same

A perpendicular magnetic recording medium comprising:

• a nonmagnetic substrate;
• an anti-ferromagnetic layer on said non-magnetic substrate;
• said non-ferromagnetic layer including a Mn alloy containing at least Ir at 10 atomic % or greater and 30 atomic % or less;
• a soft magnetic layer on said anti-ferromagnetic layer;
• and
• a hard magnetic layer on said soft magnetic layer.

A manufacturing method for a perpendicular magnetic recording medium, comprising:

• forming an anti-ferromagnetic layer on a non-magnetic substrate;
• forming a soft magnetic layer on said anti-ferromagnetic layer;
• forming a magnetic recording layer on said soft magnetic layer;
• forming a protective layer on said magnetic recording layer;
• forming a liquid lubricant layer on said protective layer;
• said anti-ferromagnetic layer is an Mn alloy containing at least Co at 10 atomic % or greater and 50 atomic % or less;
• during film formation of at least said anti-ferromagnetic layer and said soft magnetic layer, applying a magnetic field of 796 A/m (10 Oe) or greater that is parallel to a radial direction of said non-magnetic substrate.

A manufacturing method for a perpendicular magnetic recording medium comprising:

• forming an anti-ferromagnetic layer on a non-magnetic substrate;
• forming a soft magnetic layer on said anti-ferromagnetic layer;
• forming a magnetic recording layer on said soft magnetic layer;
• forming a protective layer on said magnetic recording layer;
• forming a liquid lubricant layer on said protective layer;
• said anti-ferromagnetic layer is an Mn alloy containing at least Ir at 10 atomic % or greater and 30 atomic % or less;
• during film formation of at least said anti-ferromagnetic layer and said soft magnetic layer, applying a magnetic field of 796 A/m (10 Oe) or greater that is parallel to a radial direction of said non-magnetic substrate.