초록 ▼

A magnetic recording medium is provided in which film thickness of the DLC layer is 5 nm or less. A tangential force of the magnetic head is small. The magnetic recording medium has excellent durability to sliding property. A magnetic storage device can be realized that is capable of stable floating

A magnetic recording medium is provided in which film thickness of the DLC layer is 5 nm or less. A tangential force of the magnetic head is small. The magnetic recording medium has excellent durability to sliding property. A magnetic storage device can be realized that is capable of stable floating of the magnetic head at 10 nm or less. The magnetic recording medium has a primary coat layer, a magnetic layer, and an overcoat layer on a substrate, wherein the overcoat layer is composed of a DLC film, and in an area in which depth from the surface of the DLC film is 13 .ANG. or less, there is formed a CN bond.

대표청구항 ▼

1. A magnetic recording medium having a primary coat layer, a magnetic layer, an overcoat layer and a lubricating layer on a substrate, wherein said overcoat layer is composed of a DLC film, and a protruded portion of surface roughness on the surface of said DLC film is formed by CN bond, and said b

1. A magnetic recording medium having a primary coat layer, a magnetic layer, an overcoat layer and a lubricating layer on a substrate, wherein said overcoat layer is composed of a DLC film, and a protruded portion of surface roughness on the surface of said DLC film is formed by CN bond, and said bond is composed of a mixture of --C--N, --C=N, and --C≡N bonds. 2. A magnetic storage device, wherein a magnetic recording medium according to claim 1 is installed in a rotationally-driven spindle, a magnetic head is positioned on the surface of said magnetic recording medium, and said magnetic recording medium rotates, whereby data is read and written on said magnetic recording medium. 3. A magnetic recording medium having a primary coat layer, a magnetic layer, an overcoat layer and a lubricating layer on a substrate, wherein said overcoat layer is composed of a DLC film, and in an area, in which a depth from the surface of said DLC film is 15 .ANG. or less, most of a CN bond is formed. 4. The magnetic recording medium according to claim 3, wherein a nitrogen content based on said CN bond in said area is 5 at % or higher. 5. The magnetic recording medium according to claim 3, wherein a nitrogen content based on said CN bond in said area is 10 at % or higher. 6. The magnetic recording medium according to claim 3, wherein surface roughness of said substrate is 0.4 nm or less at average roughness Ra, and roughness of the surface of said DLC film is higher than surface roughness of said substrate, and is 2 nm or less at Ra. 7. The magnetic recording medium according to claim 3, wherein a protruded portion of surface roughness on the surface of said DLC film is formed by CN bond, and said bond is composed of a mixture of --C--N, --C=N, and --C≡N bonds. 8. The magnetic recording medium according to claim 3, wherein a ratio of a fixed portion of said lubricating layer is 25% or higher. 9. A magnetic recording medium having a primary coat layer, a magnetic layer, an overcoat layer and a lubricating layer on a substrate, wherein said overcoat layer is composed of a DLC film, and surface roughness on the surface of said substrate is less than 0.4 nm in Ra, and surface roughness on the surface of said DLC film is larger than that of the surface roughness on the surface of said substrate and is less than 2 nm in Ra. 10. A production method for a magnetic recording medium for forming at least a primary coat layer, a magnetic layer, an overcoat layer and a lubricating layer on a substrate in this order, wherein a surface of said DLC film is treated at accelerating voltage of a N (nitrogen) ion beam being 150 eV or less after said DLC film is formed.