Heat-sinks for optical near-field transducers
View Patent ↗Thermal energy is generated within an optical NFT when in operation within a HAMR head. A heat-sink assembly within the HAMR head extracts thermal energy from the optical NFT and transmits the thermal energy via convection to air surrounding the HAMR head, radiation to surfaces adjacent to the HAMR head, and/or conduction to other parts of the HAMR head. The thermal energy generated within the optical NFT is conducted to the heat-sink. An air-bearing surface of the heat-sink convectively transfers at least some of the thermal energy to air passing between the air-bearing surface and a surface of an adjacent magnetic medium. Further, some of the thermal energy may also radiatively transfer from the air-bearing surface to the magnetic medium.
1. A heat assisted magnetic recording head comprising:
an optical near-field transducer; and
a heat-sink assembly in thermally conductive contact with the optical near-field transducer and having a convectively cooled surface, wherein the heat-sink assembly at least partially encapsulates the near-field transducer, wherein the heat-sink assembly includes a truncated conical extension from the optical near-field transducer.
2. The heat assisted magnetic recording head of claim 1 , wherein the heat-sink assembly at least partially encapsulates the optical near-field transducer along a direction away from magnetic media.
3. The heat assisted magnetic recording head of claim 1 , wherein the heat-sink assembly includes a pair of wing-like extensions from the optical near-field transducer.
4. The heat assisted magnetic recording head of claim 1 , further comprising:
a write pole, wherein the heat-sink assembly includes a metallic overlay on the write pole.
5. The heat assisted magnetic recording head of claim 1 , wherein the heat-sink assembly includes a first heat-sink and a second heat-sink, wherein the first heat-sink is in thermally conductive contact with the second heat-sink.
6. The heat assisted magnetic recording head of claim 1 , wherein the heat-sink assembly occupies an air-bearing surface of the heat assisted magnetic recording head.
7. The heat assisted magnetic recording head of claim 1 , wherein the heat-sink assembly includes an optical quality dielectric.
8. The heat assisted magnetic recording head of claim 1 , wherein the heat-sink assembly includes a non-magnetic metal.
9. The heat assisted magnetic recording head of claim 1 , wherein the convectively-cooled surface is an air-bearing surface facing a magnetic recording medium.
10. A system comprising:
a first heat-sink in conductive contact with an optical near-field transducer; and
a second heat-sink in conductive contact with the first heat-sink, wherein one or both of the first heat-sink and second heat-sink includes a convectively-cooled surface, wherein one or both of the first and second heat-sinks include a pair of wing-like extensions from the optical near-field transducer.
11. The system of claim 10 , wherein one or both of the first and second heat-sinks at least partially encapsulates the optical near-field transducer.
12. The system of claim 10 , wherein the pair of wing-like extensions extend away from the optical near-field transducer along an air-bearing surface.
13. The system of claim 10 , wherein one or both of the first and second heat-sinks include a truncated conical extension from the optical near-field transducer.
14. The system of claim 10 , further comprising:
a write pole, wherein one or both of the first and second heat-sinks is also in conductive contact with the write pole and includes a metallic overlay on the write pole.
15. The system of claim 10 , wherein the convectively-cooled surface is an air-bearing surface facing a magnetic recording medium.
16. A method for dissipating thermal energy within an optical near-field transducer, comprising:
generating thermal energy within the optical near-field transducer;
conducting at least part of the thermal energy within the optical near-field transducer to a heat-sink assembly in conductive contact with the optical near-field transducer; and
convectively transferring at least part of the thermal energy conducted to the heat-sink assembly to an air-bearing surface at a convectively-cooled surface, wherein the heat-sink assembly includes a truncated conical extension from the optical near-field transducer.
17. The method of claim 16 , wherein the heat-sink assembly includes a first heat-sink and a second heat-sink, wherein the first heat-sink is in thermally conductive contact with the second heat-sink.
18. The method of claim 16 , wherein the heat-sink assembly occupies the air-bearing surface of a heat assisted magnetic recording head.
19. The method of claim 16 , wherein the convectively-cooled surface faces a magnetic recording medium.