Magnetic storage apparatus including a magnetic recording medium having a barrier layer between two heat sink layers

1. A magnetic recording medium comprising:

a substrate;

a first heat sink layer provided on the substrate;

a first barrier layer provided on the first heat sink layer;

a second heat sink layer provided on the first barrier layer; and

a magnetic layer provided on the second heat sink layer,

wherein the magnetic layer is made of a material including a first main component that is an alloy having a L1 0 crystal structure and a content of 50 at % or higher, or content of 50 mol % or higher, and

wherein the first barrier layer is made of a material including a second main component that is one of an oxide, a nitride, and a carbide having a content of 50 at % or higher, or content of 50 mol % or higher.

2. The magnetic recording medium as claimed in claim 1 , wherein the second main component has a NaCl type crystal structure.

3. The magnetic recording medium as claimed in claim 2 , wherein the second main component having the NaCl type crystal structure is selected from a group consisting of MgO, TiO, NiO, TiN, TaN, NbN, HfN, ZrN, VN, CrN, TiC, TaC, NbC, HfC, and ZrC.

4. The magnetic recording medium as claimed in claim 1 , wherein the first barrier layer has a thickness in a range of 1 nm to 10 nm.

5. The magnetic recording medium as claimed in claim 1 , wherein the second main component has a thermal conductivity of 80 W/m·K or lower.

6. The magnetic recording medium as claimed in claim 1 , wherein the second heat sink layer has a thickness less than a thickness of the first heat sink layer.

7. The magnetic recording medium as claimed in claim 1 , wherein each of the first heat sink layer and the second heat sink layer is made of a material including a third main component that is selected from a group consisting of Ag, Au, Al, Cu, Rh, Mo, and W, and having a content of 50 at % or higher, or content of 50 mol % or higher.

8. The magnetic recording medium as claimed in claim 1 , wherein each of the first heat sink layer and the second heat sink layer is made of a material including a third main component that has a thermal conductivity of 100 W/m·K or higher.

9. The magnetic recording medium as claimed in claim 1 , further comprising:

a second barrier layer provided between the second heat sink layer and the magnetic layer,

wherein the second barrier layer is made of a material including a main component having a NaCl type crystal structure and selected from a group consisting of MgO, TiO, NiO, TiN, TaN, NbN, HfN, and TiC, and having a content of 50 at % or higher, or content of 50 mol % or higher.

10. A magnetic storage apparatus comprising:

a magnetic recording medium;

a magnetic head configured to write information to and read information from the magnetic recording medium; and

a casing configured to accommodate the magnetic recording medium and the magnetic head,

wherein the magnetic head includes a laser light generator configured to generate laser light, a waveguide configured to guide the laser light to a tip end of the magnetic head, and a near-field light generator configured to generate near-field light that heats the magnetic recording medium,

wherein the magnetic recording medium includes a substrate, a first heat sink layer, a first barrier layer, a second heat sink layer, and a magnetic layer that are successively stacked,

wherein the magnetic layer is made of a material including a first main component that is an alloy having a L1 0 crystal structure and a content of 50 at % or higher, or content of 50 mol % or higher, and

wherein the first barrier layer is made of a material including a second main component that is one of an oxide, a nitride, and a carbide having a content of 50 at % or higher, or content of 50 mol % or higher.

11. The magnetic storage apparatus as claimed in claim 10 , wherein the second main component of the first barrier layer of the magnetic recording medium has a NaCl type crystal structure and is selected from a group consisting of MgO, TiO, NiO, TiN, TaN, NbN, HfN, ZrN, VN, CrN, TiC, TaC, NbC, HfC, and ZrC.

12. The magnetic storage apparatus as claimed in claim 10 , wherein the first barrier layer of the magnetic recording medium has a thickness in a range of 1 nm to 10 nm.

13. The magnetic storage apparatus as claimed in claim 10 , wherein the second main component of the first barrier layer of the magnetic recording medium has a thermal conductivity of 80 W/m·K or lower.

14. The magnetic storage apparatus as claimed in claim 10 , wherein the second heat sink layer of the magnetic recording medium has a thickness less than a thickness of the first heat sink layer.

15. The magnetic storage apparatus as claimed in claim 10 , wherein each of the first heat sink layer and the second heat sink layer of the magnetic recording medium is made of a material including a third main component that is selected from a group consisting of Ag, Au, Al, Cu, Rh, Mo, and W, and having a content of 50 at % or higher, or content of 50 mol % or higher.

16. The magnetic storage apparatus as claimed in claim 10 , wherein each of the first heat sink layer and the second heat sink layer of the magnetic recording medium is made of a material including a third main component that has a thermal conductivity of 100 W/m·K or higher.

17. The magnetic storage apparatus as claimed in claim 10 , wherein the magnetic recording medium further includes:

a second barrier layer provided between the second heat sink layer and the magnetic layer,

wherein the second barrier layer is made of a material including a main component having a NaCl type crystal structure and selected from a group consisting of MgO, TiO, NiO, TiN, TaN, NbN, HfN, and TiC, and having a content of 50 at % or higher, or content of 50 mol % or higher.