Claims
- 1. A magnetic recording medium comprising:
a substrate; and a perpendicular magnetic layer formed on said substrate and having an anisotropic magnetic field Hk and a saturation magnetization Ms which satisfy the following relation: 2<Hk/4πMs<5.
- 2. The magnetic recording medium according to claim 1, wherein said perpendicular magnetic layer is made mainly of CoPtCrO series alloy.
- 3. The magnetic recording medium according to claim 1, further comprising an underlying layer formed between said substrate and said magnetic layer and having an HCP structure or an FCC structure.
- 4. The magnetic recording medium according to claim 3, wherein said underlying layer being formed of at least one material selected from the group consisting of ruthenium, titanium, hafnium, rhenium, Palladium, Platinum and alloys thereof.
- 5. The magnetic recording medium according to claim 3, further comprising a seed layer formed between said substrate and said underlying layer and formed of at least one material selected from the group consisting of titanium, titanium nitride, ruthenium, hafnium, rhenium, palladium, platinum, nonmagnetic cobalt chromium alloy, magnesium oxide, indium tin oxide, and ferric aluminium.
- 6. The magnetic recording medium according to claim 3, further comprising a soft magnetic layer formed between said substrate and said underlying layer.
- 7. The magnetic recording medium according to claim 5, further comprising a soft magnetic layer formed between said substrate and said seed layer.
- 8. The magnetic recording medium according to claim 1, wherein said anisotropic magnetic field Hk and said saturation magnetization Ms satisfy the following relation.
2.5≦Hk/4πMs≦4.5
- 9. A magnetic recording/reproducing apparatus, compring:
a magnetic recording medium; a drive mechanism configured to support and rotate said magnetic recording medium; and a magnetic head configured to record/reproduce information in and from the magnetic recording medium; wherein said magnetic recording medium has an anisotropic magnetic field Hk and a saturation magnetization Ms which satisfy the following relation: 2<Hk/4πMs<5.
- 10. The magnetic recording/reproducing apparatus according to claim 9, wherein said perpendicular magnetic layer is made mainly of CoPtCrO series alloy.
- 11. The magnetic recording/reproducing apparatus according to claim 9, further comprising an underlying layer formed between said substrate and said magnetic layer and having an HCP structure or an FCC structure.
- 12. The magnetic recording/reading apparatus according to claim 11, wherein said underlying layer being formed of at least one material selected from the group consisting of ruthenium, titanium, hafnium, rhenium, Palladium, Platinum, and alloys thereof.
- 13. The magnetic recording/reading apparatus according to claim 12, further comprising a seed layer formed between said substrate and said underlying layer and formed of at least one material selected from the group consisting of titanium, titanium nitride, ruthenium, hafnium, rhenium, palladium, platinum nonmagnetic cobalt chromium alloy, magnesium oxide, indium tin oxide, and ferric aluminium.
- 14. The magnetic recording/reading apparatus according to claim 11, further comprising a soft magnetic layer formed between said substrate and said underlying layer.
- 15. The magnetic recording/reading apparatus according to claim 13, further comprising a soft magnetic layer formed between said substrate and said seed layer.
- 16. The magnetic recording/reading apparatus according to claim 9, wherein said anisotropic magnetic field Hk and said saturation magnetization Ms satisfy the following relation.
2.5≦Hk/4πMs≦4.5
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-030727 |
Feb 2000 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-030727, filed Feb. 8, 2000, the entire contents of which are incorporated herein by reference.