Claims
- 1. A magnetic recording medium for perpendicular recording, comprising:
(a) a substrate; (b) a seedlayer comprising tantalum disposed over said substrate; (c) an underlayer disposed on said seedlayer, wherein said underlayer comprises ruthenium; and (d) a magnetic recording layer disposed on said underlayer wherein said magnetic recording layer comprises a metallic material having an easy magnetization axis oriented perpendicular to said magnetic recording layer.
- 2. A magnetic recording medium as recited in claim 1, wherein said metallic material comprises a hcp crystallite structure having a c-axis oriented perpendicular to said magnetic recording layer.
- 3. A magnetic recording medium as recited in claim 1, wherein said metallic material is a cobalt-containing alloy.
- 4. A magnetic recording medium as recited in claim 1, wherein said metallic material is a CoCr alloy.
- 5. A magnetic recording medium as recited in claim 1, wherein said metallic material is a CoCrPt alloy.
- 6. A magnetic recording medium as recited in claim 1, wherein said metallic material is a CoCrPtB alloy.
- 7. A magnetic recording medium as recited in claim 1, wherein said metallic material is a cobalt-containing alloy comprising 10 at. % to 30 at. % Cr and 8 at. % to 60 at. % Pt.
- 8. A magnetic recording medium as recited in claim 1, wherein said metallic material is a cobalt-containing alloy comprising 10 at. % to 30 at. % Cr, 8 at. % to 60 at. % Pt and up to 30 at. % B.
- 9. A magnetic recording medium as recited in claim 1, wherein said magnetic recording layer has an average thickness of from about 15 nanometers to about 30 nanometers.
- 10. A magnetic recording medium as recited in claim 1, wherein said seedlayer comprises at least about 80 at. % Ta.
- 11. A magnetic recording medium as recited in claim 1, wherein said seedlayer consists essentially of tantalum.
- 12. A magnetic recording medium as recited in claim 1, wherein said seedlayer is substantially amorphous.
- 13. A magnetic recording medium as recited in claim 1, wherein said seedlayer has an average thickness of from about 1 nanometer to about 30 nanometers.
- 14. A magnetic recording medium as recited in claim 1, wherein said underlayer comprises at least about 80 at. % Ru.
- 15. A magnetic recording medium as recited in claim 1, wherein said underlayer consists essentially of ruthenium.
- 16. A magnetic recording medium as recited in claim 1, wherein said underlayer has an average thickness of at least about 1 nanometer.
- 17. A magnetic recording medium as recited in claim 1, wherein said underlayer has an average thickness of from about 10 nanometers to about 20 nanometers.
- 18. A magnetic recording medium as recited in claim 1, wherein said magnetic recording medium further comprises a soft magnetic layer disposed between said substrate and said seedlayer.
- 19. A magnetic recording medium as recited in claim 18, wherein said soft magnetic layer comprises NiFe.
- 20. A magnetic recording medium as recited in claim 18, wherein said soft magnetic layer comprises a CoZrNb alloy.
- 21. A magnetic recording medium as recited in claim 18, further comprising an adhesive layer disposed between said substrate and said soft magnetic layer.
- 22. A magnetic recording medium as recited in claim 18, further comprising an adhesive layer disposed between said substrate and said soft magnetic layer, wherein said adhesive layer comprises tantalum.
- 23. A magnetic recording medium as recited in claim 1, further comprising a carbon protective layer disposed over said magnetic recording layer.
- 24. A magnetic recording medium as recited in claim 23, further comprising a lubricant layer disposed over said carbon protective layer.
- 25. A magnetic recording medium as recited in claim 1, wherein said substrate comprises a glass-containing material.
- 26. A magnetic recording medium as recited in claim 1, wherein said substrate comprises aluminum coated with NiP.
- 27. A magnetic recording medium as recited in claim 1, wherein said magnetic recording layer comprises a cobalt-containing alloy and has a perpendicular coercivity (Hc⊥) of at least about 2500 Oe.
- 28. A magnetic recording medium as recited in claim 27, wherein said magnetic recording layer has a negative nucleation field.
- 29. A magnetic recording medium as recited in claim 27, wherein said magnetic recording layer has a ratio of remnant magnetization to saturation magnetization (Mr/Ms) of about 1.
- 30. A magnetic recording medium for perpendicular recording, comprising:
(a) a substrate; (b) a seedlayer disposed over said substrate; (c) an underlayer disposed on said seedlayer; and (d) a magnetic recording layer disposed on said underlayer, wherein said magnetic recording layer comprises a cobalt-containing alloy having an easy magnetization axis oriented perpendicular to said magnetic recording layer and having a perpendicular coercivity of at least about 2500 Oe.
- 31. A magnetic recording medium as recited in claim 30, wherein said magnetic recording layer has a negative nucleation field.
- 32. A magnetic recording medium as recited in claim 30, wherein said magnetic recording layer has a ratio of remnant magnetization to saturation magnetization (Mr/Ms) of about 1.
- 33. A magnetic recording medium as recited in claim 30, wherein said magnetic recording layer has a horizontal coercivity of not greater than about 200 Oe.
- 34. A magnetic recording medium as recited in claim 30, wherein said underlayer comprises at least about 80 at. % ruthenium.
- 35. A magnetic recording medium as recited in claim 30, wherein said underlayer consists essentially of ruthenium.
- 36. A magnetic recording medium as recited in claim 30, wherein said seedlayer comprises at least about 80 at. % tantalum.
- 37. A magnetic recording medium as recited in claim 36, wherein said seedlayer is substantially amorphous.
- 38. A magnetic recording medium as recited in claim 36, wherein said seedlayer has an average thickness of not greater than about 30 nanometers.
- 39. A magnetic recording medium as recited in claim 30, wherein said seedlayer consists essentially of tantalum.
- 40. A magnetic recording medium as recited in claim 30, wherein said cobalt-containing alloy has a hexagonal crystallite structure having a c-axis oriented perpendicular to said magnetic recording layer.
- 41. A magnetic recording medium as recited in claim 40, wherein said cobalt-containing alloy is a CoCr alloy.
- 42. A magnetic recording medium as recited in claim 40, wherein said cobalt-containing alloy is a CoCrPt alloy.
- 43. A magnetic recording medium as recited in claim 40, wherein said cobalt-containing alloy is a CoCrPtB alloy.
- 44. A magnetic recording medium as recited in claim 40, wherein said cobalt-containing alloy comprises 10 at. % to 30 at. % Cr and 8 at. % to 60 at. % Pt, the balance consisting essentially of Co.
- 45. A magnetic recording medium as recited in claim 40, wherein said cobalt-containing alloy comprises 10 at. % to 30 at. % Cr, 8 at. % to 60 at. % Pt, up to 30 at. % B, the balance consisting essentially of Co.
- 46. A magnetic recording medium for perpendicular recording, comprising:
(a) a substrate; (b) a seedlayer disposed over said substrate and comprising at least about 90 at. % tantalum; (c) an underlayer disposed on said seedlayer, wherein said underlayer comprises at least about 90 at. % ruthenium; and (d) a magnetic recording layer disposed on said underlayer, wherein said magnetic recording layer comprises a CoCr alloy having a hcp crystallite structure and having a c-axis oriented perpendicular to said magnetic recording layer and having a perpendicular coercivity of at least about 2500 Oe.
- 47. A magnetic recording medium as recited in claim 46, wherein said CoCr alloy is a CoCrPt alloy.
- 48. A magnetic recording medium as recited in claim 46, wherein said CoCr alloy is a CoCrPtB alloy.
- 49. A magnetic recording medium as recited in claim 46, wherein said underlayer consists essentially of ruthenium.
- 50. A magnetic recording medium as recited in claim 46, wherein said seedlayer consists essentially of tantalum.
- 51. A magnetic recording medium as recited in claim 46, wherein said seedlayer is substantially amorphous.
- 52. A magnetic recording medium as recited in claim 46, wherein said seedlayer has an average thickness of not greater than about 30 nanometers.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Patent Application Serial No. 60/345,404, filed on Nov. 9, 2001, the disclosure of which is incorporated herein by reference in its entirety.
Provisional Applications (1)
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Number |
Date |
Country |
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60345404 |
Nov 2001 |
US |