Claims
- 1. A perpendicular magnetic recording medium comprising:
a non-magnetic substrate, a soft magnetic backlayer formed on the non-magnetic substrate, a perpendicular magnetic layer formed above the soft magnetic backlayer, a polycrystalline MgO film inserted between the soft magnetic backlayer and the perpendicular magnetic layer.
- 2. A perpendicular magetnic recording medium according to claim 1,
wherein the polycrystalline MgO film has a hexagonal close-packed structure.
- 3. A perpendicular magnetic recording medium according to claim 1,
wherein the polycrystalline MgO film is oriented (100).
- 4. A perpendicular magnetic recording medium according to claim 1,
wherein a distance between a surface of the soft magnetic backlayer and the perpendicular magnetic layer is within 20 nm.
- 5. A perpendicular magnetic recording medium according to claim 1,
wherein the non-magnetic layer has a hexagonal close-packed structure.
- 6. A perpendicular magnetic recording medium according to claim 1, wherein a non-magnetic layer comprising a material comprising Ti, Zr, Hf, Cr, Mo, Nb, V, W, Si, Ge, B, C or alloys having these elements as their main component, or oxides selected from the group consisting of SiO2, Al2O3 or ZrO2 is provided between the soft magnetic back layer and the polycrystalline MgO film.
- 7. A perpendicular magnetic recording medium according to claim 1, wherein a thickness of said polycrystalline MgO film is from 1 nm to less than 13 nm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-191551 |
Jul 1999 |
JP |
|
Parent Case Info
[0001] This is a continuation of application No. 09/610,455 filed Jul. 5, 2000, the content of which is incorporated herein by reference in its entirety.
Continuations (1)
|
Number |
Date |
Country |
Parent |
09610455 |
Jul 2000 |
US |
Child |
10404446 |
Apr 2003 |
US |