Recording medium for heat assisted magnetic recording and method of forming the same
Various aspects of this disclosure provide a recording medium for heat-assisted-magnetic-recording (HAMR). The recording medium may include a substrate. The recording medium may further include a recording layer. The recording medium may also include a thermal control layer between the recording layer and the substrate. The thermal control layer may have a thermal conductivity that increases with increasing temperature.
1. A recording medium for heat assisted magnetic recording (HAMR), the recording medium comprising:
a substrate;
a recording layer; and
a thermal control layer between the recording layer and the substrate;
wherein the thermal control layer has a thermal conductivity that increases with temperature, wherein the thermal control layer comprises copper (I) oxide.
2. The recording medium according to claim 1 ,
wherein the thermal control layer is doped with nitrogen.
3. The recording medium according to claim 1 , further comprising:
a heat sink layer between the thermal control layer and the substrate.
4. The recording medium according to claim 3 ,
wherein the heat sink layer comprises copper.
5. The recording medium according to claim 4 ,
wherein the copper is formed by depositing copper nitride and heating the copper nitride.
6. The recording medium according to claim 1 , further comprising:
an underlayer between the recording layer and the substrate.
7. The recording medium according to claim 6 ,
wherein the underlayer comprises at least one of magnesium oxide, titanium carbide, titanium nitride and platinum.
8. The recording medium according to claim 6 ,
wherein the underlayer is between the recording layer and the thermal control layer.
9. The recording medium according to claim 1 ,
wherein the thermal control layer has a thickness selected from a range of about 3 nm to about 6 nm.
10. The recording medium according to claim 1 ,
wherein the recording layer comprises iron-platinum.
11. The recording medium according to claim 1 , further comprising:
a seed layer between the substrate and the thermal control layer.
12. The recording medium according to claim 11 ,
wherein the seed layer comprises nickel tantalum.
13. The recording medium according to claim 1 , further comprising:
an overcoat layer on the recording layer.
14. A method of forming a recording medium for heat assisted magnetic recording (HAMR), the method comprising:
providing a substrate;
forming a recording layer; and
forming a thermal control layer between the recording layer and the substrate;
wherein the thermal control layer has a thermal conductivity that increases with temperature; and
wherein the thermal control layer comprises copper (I) oxide.
15. The method according to claim 14 ,
wherein the thermal control layer is formed before forming the recording layer.
16. The method according to claim 14 , further comprising:
forming a heat sink layer between the thermal control layer and the substrate.
17. The method according to claim 16 ,
wherein the heat sink layer comprises copper.
18. The method according to claim 17 ,
wherein forming the heat sink layer comprises:
depositing copper nitride; and
heating the copper nitride to form copper.
19. The method according to claim 18 ,
wherein heating of the copper nitride forms nitrogen; and,
wherein nitrogen is absorbed by the thermal control layer.