| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic disk wherein even when the thickness of a protective film becomes≤5 nm, durability is high and the floating stability of a magnetic head is not deteriorated. SOLUTION: In the magnetic disk having at least a magnetic metal film, a carbon protective film and a fluorine containing lubricant film formed on a nonmagnetic substrate, the carbon protective film is a diamond like carbon (DLC), hydrogen concentrations in the protective film and on the surface thereof are 1-45 at%, the product of the ratio of symmetric CH<SB>2</SB>bonding to asymmetric bonding CH<SB>2</SB>in the CH<SB>2</SB>bonding of an<SB>sp</SB><SP>3</SP>structure and the hydrogen concentration is 0.05-0.25, and a liquid lubricant coated on the protective film is a lubricant represented by chemical formula (1). Here, m is 0 or the integer of≥1, and n is 0 or the integer of≥1, and an average molecular weight is 1,000-6,000. COPYRIGHT: (C)2004,JPO
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