Metallic thin film magnetic recording medium

A metallic thin film magnetic recording medium comprising:

• a magnetic layer formed on one face of a nonmagnetic supporting body according to vacuum thin film formation technology;
• wherein a thickness of said nonmagnetic supporting body is 5 μm or less, and
• wherein a thickness of said magnetic layer is 20 nm-100 nm, said metallic thin film magnetic recording medium further comprising:
• a lining layer having a thickness of 20 nm-200 nm formed on another face opposite to said magnetic layer formation face, of one of metal, non-metal, alloy and oxide compound thereof according to vacuum thin film formation technology;
• wherein said magnetic layer is formed on said nonmagnetic supporting body via a Cr foundation layer formed by a sputtering method, said magnetic layer being formed of any one of CoCrTa, CoCrPt, CoCrPtTa, CoPtSiO2, and CoPtB-O.

A metallic thin film magnetic recording medium comprising:

• a magnetic layer formed on one face of a nonmagnetic supporting body according to vacuum thin film formation technology,
• wherein a thickness of said nonmagnetic supporting body is 5 μm or less, and
• wherein a thickness of said magnetic layer is 20 nm-100 nm, said metallic thin film magnetic recording medium further comprising:
• a lining layer having a thickness of 20 nm-200 nm formed on a another face opposite to said magnetic layer formation face, of one of metal, non-metal, alloy and oxide compound thereof according to vacuum thin film formation technology;
• and
• a back layer formed on said lining layer, said back layer being formed in a thickness of 10-200 nm and with a relative roughness factor (Ra) of an exposed surface of said back layer being 2-15 nm;
• wherein said magnetic layer is formed on said nonmagnetic supporting body not via the foundation layer.