Claims
- 1. A magnetic recording medium comprising at least a soft magnetic undercoat film made of a soft magnetic material, an orientation control film that controls the orientation of a film provided directly above, a perpendicular magnetization film, of which axis of easy magnetization is generally oriented perpendicular to a substrate, and a protective film, that are provided on a non-magnetic substrate, wherein
the orientation control film has an hcp structure and, at the same time, Δθ50 of the (0002) orientation plane is set within a range from 3 to 10 degrees and a difference (Δθ50 (mag)−Δθ50 (ori)) between Δθ50 (ori) of the orientation control film and Δθ50 (mag) of the perpendicular magnetization film is set within a range from 1 to 8 degrees.
- 2. The magnetic recording medium according to claim 1, wherein the orientation control film contains 50 at % or higher of one or more kinds of elements selected from Ti, Zn, Y, Zr, Ru, Re, Gd, Tb and Co.
- 3. The magnetic recording medium according to claim 2, wherein the orientation control film contains one or more kinds of elements selected from V, Cr, Mn, Fe, Co and Ni.
- 4. The magnetic recording medium according to claim 2, wherein the orientation control film contains one or more kinds of elements selected from B, C, N, O and P.
- 5. The magnetic recording medium according to claim 1, wherein the orientation control film is made of any one of 25Ag75Ge, 50Cu50Ge and 75Ru25Nb.
- 6. The magnetic recording medium according to any one of claims 1 to 5, wherein a non-magnetic intermediate film is provided between the orientation control film and the perpendicular magnetization film, while the non-magnetic intermediate film is made of a material containing 40 to 70 at % of Co.
- 7. The magnetic recording medium according to any one of claims 1 to 5, wherein the orientation control film has a granular structure and has a mean crystal grain diameter of 4 to 20 nm.
- 8. A magnetic recording medium at least comprising a soft magnetic undercoat film made of a soft magnetic material, an orientation control film that controls the orientation of a film provided directly above, a perpendicular magnetization film, of which the axis of easy magnetization is generally oriented perpendicular to a substrate, and a protective film, that are provided on a non-magnetic substrate, wherein
the orientation control film has an fcc structure and, at the same time, Δθ50 of the (111) orientation plane is set within a range from 3 to 10 degrees and a difference (Δθ50 (mag)−Δθ50 (ori)) between Δθ50 (ori) of the orientation control film and Δθ50 (mag) of the perpendicular magnetization film is set within a range from 1 to 8 degrees.
- 9. The magnetic recording medium according to claim 8, wherein the orientation control film includes more than 50 at. % of one or more than two of the elements selected from a group consisted of Ni, Cu, Pd, Ag, Pt, Ir, Au, and Al.
- 10. The magnetic recording medium according to any one of claims 1 to 9, wherein Negative nucleation field (−Hn) of the perpendicular magnetization film is equal to or higher than 0(Oe).
- 11. A method of manufacturing a magnetic recording medium, which comprises forming at least a soft magnetic undercoat film made of a soft magnetic material, an orientation control film that controls the orientation of a film provided right above, a perpendicular magnetization film of which axis of easy magnetization is generally oriented perpendicular to a substrate, and a protective film, on a non-magnetic substrate,
while controlling so that the orientation control film has an hcp structure or a fcc structure and, at the same time, Δθ50 of the (0002) orientation plane or the (111) orientation plane is set within a range from 3 to 10 degrees and the difference (Δθ50 (mag)−Δθ50 (ori)) between Δθ50 (ori) of the orientation control film and Δθ50 (mag) of the perpendicular magnetization film is set within a range from 1 to 8 degrees.
- 12. A magnetic read/write apparatus comprising a magnetic recording medium and a magnetic head that records information on the magnetic recording medium and replays the information, wherein
the magnetic recording medium comprises at least a soft magnetic undercoat film made of a soft magnetic material, an orientation control film that controls the orientation of a film provided directly above, a perpendicular magnetization film of which the axis of easy magnetization is generally oriented perpendicular to a substrate, and a protective film, that are provided on a non-magnetic substrate, while the orientation control film has an hcp structure or a fcc structure and, at the same time, Δθ50 of the (0002) orientation plane or the (111) orientation plane is set within a range from 3 to 10 degrees and the difference (Δθ50 (mag)−Δθ50 (ori)) between Δθ50 (ori) of the orientation control film and Δθ50 (mag) of the perpendicular magnetization film is set within a range from 1 to 8 degrees.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-234119 |
Aug 2001 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit pursuant to 35 U.S.C. §119(e)(1) of U.S. Provisional Application, No. 60/311,816 filed Aug. 14, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60311816 |
Aug 2001 |
US |