Systems and methods for dissipating heat from a near-field transducer in an energy assisted magnetic recording assembly
View Patent ↗Embodiments of the present invention are directed to a recording head for energy assisted magnetic recording. The recording head includes a near-field transducer (NFT) having a preselected shape and a surface, a writing pole on the NFT, and a non-metal heat dissipator positioned between the NFT surface and the writing pole. The non-metal heat dissipator includes a first portion in contact with the NFT surface, the first portion extending beyond an edge of the NFT surface in a first direction substantially perpendicular to an air bearing surface (ABS) and parallel to the NFT surface.
1. A recording head for energy assisted magnetic recording comprising:
a near-field transducer (NFT) having a preselected shape and a surface;
a writing pole on the NFT; and
a non-metal heat dissipator positioned between the NFT surface and the writing pole, the non-metal heat dissipator comprising a first portion in contact with the NFT surface, the first portion extending beyond an edge of the NFT surface in a first direction substantially perpendicular to an air bearing surface (ABS) and parallel to the NFT surface.
2. The recording head of claim 1 , wherein the non-metal heat dissipator comprises a material selected from the group consisting of AlN, BeO, BN, Si3N4, ZnS, MgF2, and TeO2.
3. The recording head of claim 1 , wherein the first portion has a width between about 250 nm and about 500 nm, inclusive, in a direction substantially parallel to the ABS and the NFT surface.
4. The recording head of claim 1 , wherein the first portion has a length in the first direction that is larger than a length of the NFT in the first direction.
5. The recording head of claim 4 , wherein the first portion has a length of at least about 800 nm in the first direction.
6. The recording head of claim 1 , wherein a portion of the first portion is spaced apart from the writing pole.
7. The recording head of claim 1 , wherein the non-metal heat dissipator further comprises a second portion extending from the first portion in the first direction, and a width of the second portion in a second direction substantially perpendicular to the first direction and parallel to the NFT surface is larger than that of the first portion.
8. The recording head of claim 7 , wherein the first portion and the second portion have the same thickness.
9. The recording head of claim 7 , wherein the first portion and the second portion have different thicknesses.
10. The recording head of claim 7 , wherein the second portion has a proximal end connected with the first portion and a distal end, and the width of the second portion gradually increases in the second direction from the proximal end toward the distal end.
11. The recording head of claim 7 , further comprising a waveguide core, wherein the NFT is positioned adjacent to the waveguide core, and the second portion of the non-metal heat dissipator is at least about 600 nm away from the waveguide core.
12. The recording head of claim 1 , further comprising a magnetic yoke connected with the writing pole, wherein the non-metal heat dissipator is in contact with the magnetic yoke.
13. The recording head of claim 1 , wherein the non-metal heat dissipator further comprises a second portion spaced apart from the NFT, the second portion having a preselected shape and a cavity.
14. The recording head of claim 13 , wherein the second portion comprises a window frame shape.
15. The recording head of claim 1 , wherein a surface of the non-metal heat dissipator conforms to a side of the writing pole.
16. The recording head of claim 15 , wherein the first portion of the non-metal heat dissipator has a thickness that gradually increases in accordance with a surface of the side of the writing pole.
17. A method for fabricating a recording head for energy assisted magnetic recording, the method comprising:
forming a near-field transducer (NFT) having a preselected shape and a surface;
forming a non-metal heat dissipator on the NFT, the non-metal heat dissipator comprising a first portion in contact with the NFT surface, the first portion extending beyond an edge of the NFT surface in a first direction substantially perpendicular to an air bearing surface (ABS) and parallel to the NFT surface; and
forming a writing pole on the non-metal heat dissipator, the non-metal heat dissipator being positioned between the writing pole and the NFT surface.
18. The method of claim 17 , wherein the non-metal heat dissipator comprises a material selected from the group consisting of AlN, BeO, BN, Si3N4, ZnS, MgF2, and TeO2.
19. The method of claim 17 , wherein the first portion has a width between about 250 nm and about 500 nm, inclusive, in a direction substantially parallel to the ABS and the NFT surface.
20. The method of claim 17 , wherein the first portion has a length in the first direction that is larger than a length of the NFT in the first direction.
21. The method of claim 20 , wherein the first portion has a length of at least about 800 nm in the first direction.
22. The method of claim 17 , wherein a portion of the first portion is spaced apart from the writing pole.
23. The method of claim 17 , wherein the non-metal heat dissipator further comprises a second portion extending from the first portion in the first direction, and a width of the second portion in a second direction substantially perpendicular to the first direction and parallel to the NFT surface is larger than that of the first portion.
24. The method of claim 23 , wherein the first portion and the second portion have the same thickness.
25. The method of claim 23 , wherein the first portion and the second portion have different thicknesses.
26. The method of claim 23 , wherein the second portion has a proximal end connected with the first portion and a distal end, and the width of the second portion gradually increases in the second direction from the proximal end toward the distal end.
27. The method of claim 23 , further comprising forming a waveguide core adjacent to the NFT, wherein the second portion of the non-metal heat dissipator is at least about 600 nm away from the waveguide core.
28. The method of claim 17 , further comprising forming a magnetic yoke connected with the writing pole, wherein the non-metal heat dissipator is in contact with the magnetic yoke.
29. The method of claim 17 , wherein the non-metal heat dissipator further comprises a second portion spaced apart from the NFT, the second portion having a preselected shape and a cavity.
30. The method of claim 29 , wherein the second portion comprises a window frame shape.
31. The method of claim 17 , wherein a surface of the non-metal heat dissipator conforms to a side of the writing pole.
32. The method of claim 31 , wherein the first portion of the non-metal heat dissipator has a thickness that gradually increases in accordance with a surface of the side of the writing pole.