Granted Patent B1

US 9,275,669 · App. 14/675,588 · Granted Mar 1, 2016

Abstract

Claims (50)

1. A magnetic recording medium, comprising:

a substrate;

a plurality of magnetic layers disposed over the substrate;

a capping layer structure disposed over the plurality of magnetic layers, the capping layer structure comprising at least one capping layer and an amorphous ferri-magnetic material layer; and

a carbon overcoat layer disposed on the capping layer structure.

2. The magnetic recording medium of claim 1 , wherein the amorphous ferri-magnetic material layer comprises Tb.

3. The magnetic recording medium of claim 2 , wherein the amorphous ferri-magnetic material layer comprises TbFeCo.

4. The magnetic recording medium of claim 3 , wherein the amorphous ferri-magnetic material layer has a thickness of greater than 0 and less than 1 nm.

5. The magnetic recording medium of claim 4 , wherein the at least one capping layer comprises a single capping layer.

6. The magnetic recording medium of claim 5 , wherein the single capping layer is disposed on the amorphous ferri-magnetic material layer.

7. The magnetic recording medium of claim 1 , wherein the at least one capping layer comprises a first capping layer and a second capping layer.

8. The magnetic recording medium of claim 1 , wherein the amorphous ferri-magnetic material layer comprises TbFeCo and the Tb is present in an amount of up to 30 percent by weight.

9. A magnetic recording medium, comprising:

a substrate;

a plurality of magnetic layers disposed over the substrate;

a capping layer structure disposed over the plurality of magnetic layers, the capping layer structure comprising at least one capping layer and an amorphous ferri-magnetic material layer, wherein the at least one capping layer comprises a first capping layer and a second capping layer, wherein the first capping layer is disposed on the amorphous ferri-magnetic material layer and the second capping layer is disposed on the first capping layer; and

a carbon overcoat layer disposed on the capping layer structure.

10. A magnetic recording medium, comprising:

a substrate;

a plurality of magnetic layers disposed over the substrate;

a capping layer structure disposed over the plurality of magnetic layers, the capping layer structure comprising at least one capping layer and an amorphous ferri-magnetic material layer, wherein the at least one capping layer comprises a first capping layer and a second capping layer, wherein the amorphous ferri-magnetic material layer is disposed on the first capping layer and the second capping layer is disposed on the amorphous ferri-magnetic material layer; and

a carbon overcoat layer disposed on the capping layer structure.

11. A magnetic recording device, comprising:

a magnetic recording head disposed on a slider; and

a magnetic recording medium disposed opposite the magnetic recording head, the magnetic recording medium comprising:

a substrate;

a plurality of magnetic layers disposed over the substrate;

a capping layer structure disposed over the plurality of magnetic layers, the capping layer structure comprising at least one capping layer and an amorphous ferri-magnetic material layer; and

a carbon overcoat layer disposed on the capping layer structure.

12. The magnetic recording device of claim 11 , wherein the amorphous ferri-magnetic material layer comprises Tb.

13. The magnetic recording device of claim 12 , wherein the amorphous ferri-magnetic material layer comprises TbFeCo.

14. The magnetic recording device of claim 13 , wherein the amorphous ferri-magnetic material layer has a thickness of greater than 0 and less than 2 nm.

15. The magnetic recording device of claim 14 , wherein the at least one capping layer comprises a single capping layer.

16. The magnetic recording device of claim 15 , wherein the single capping layer is disposed on the amorphous ferri-magnetic material layer.

17. The magnetic recording device of claim 11 , wherein the at least one capping layer comprises a first capping layer and a second capping layer.

18. The magnetic recording device of claim 17 , wherein the amorphous ferri-magnetic material layer comprises TbFeCo.

19. A magnetic recording device, comprising:

a magnetic recording head disposed on a slider; and

a magnetic recording medium disposed opposite the magnetic recording head, the magnetic recording medium comprising:

a substrate;

a plurality of magnetic layers disposed over the substrate;

a capping layer structure disposed over the plurality of magnetic layers, the capping layer structure comprising at least one capping layer and an amorphous ferri-magnetic material layer, wherein the at least one capping layer comprises a first capping layer and a second capping layer, wherein the first capping layer is disposed on the amorphous ferri-magnetic material layer and the second capping layer is disposed on the first capping layer; and

a carbon overcoat layer disposed on the capping layer structure.

20. A magnetic recording device, comprising:

a magnetic recording head disposed on a slider; and

a magnetic recording medium disposed opposite the magnetic recording head, the magnetic recording medium comprising:

a substrate;

a plurality of magnetic layers disposed over the substrate;

a capping layer structure disposed over the plurality of magnetic layers, the capping layer structure comprising at least one capping layer and an amorphous ferri-magnetic material layer, wherein the at least one capping layer comprises a first capping layer and a second capping layer, wherein the amorphous ferri-magnetic material layer is disposed on the first capping layer and the second capping layer is disposed on the amorphous ferri-magnetic material layer; and

a carbon overcoat layer disposed on the capping layer structure.

Assignments (9)