Claims
- 1. A perpendicular magnetic recording medium comprising:
- a non-magnetic base;
- a first magnetic layer of low-coercive force material formed on said non-magnetic base, said first magnetic layer consisting essentially of an alloy which is mainly composed of cobalt and additionally of tantalum; and
- a second magnetic cobalt alloy layer having a composition different from said first magnetic layer and having a direction of easy magnetization in a direction perpendicular to the surface of said recording medium formed on said first magnetic layer.
- 2. A perpendicular magnetic recording medium according to claim 1, wherein a Ta concentration of said first magnetic layer is at least 6.4 atomic %.
- 3. A perpendicular magnetic recording medium according to claim 2, wherein said first magnetic layer is amorphous.
- 4. A perpendicular magnetic recording medium according to claim 1, wherein said second magnetic cobalt alloy layer additionally contains Cr.
- 5. A perpendicular magnetic recording medium according to claim 1, wherein said second magnetic cobalt alloy layer additionally contains Cr and Ta.
- 6. A perpendicular magnetic recording medium according to claim 5, wherein the Ta concentration of said second magnetic cobalt alloy layer is from 2 atomic % to 10 atomic %, with the proviso that sum of the Cr-Ta concentrations is 27 atomic % at the highest.
- 7. A perpendicular nonmagnetic according to claim 1 wherein said nonmagnetic base is a polyethylene terephtalate film.
Priority Claims (2)
Number |
Date |
Country |
Kind |
57-22080 |
Feb 1982 |
JPX |
|
57-50975 |
Mar 1982 |
JPX |
|
Parent Case Info
This is a division, of application Ser. No. 466,863, filed Feb. 16, 1983, now U.S. Pat. No. 4,576,700.
US Referenced Citations (5)
Non-Patent Literature Citations (1)
Entry |
Kadokura et al., IEEE Trans. on Magnetics, vol. MAG-17, No. 6, Nov. 1981, pp. 3175-3177. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
466863 |
Feb 1983 |
|