Trailing edge optimized near field transducer having non-rectangular pin cross section
View Patent ↗A near field transducer (NFT) for use in an energy assisted magnetic recording (EAMR) head and configured to direct energy to a recording media is disclosed. The NFT comprises a disk section; and a pin section extending towards an air bearing surface (ABS) from the disk section. The pin section has a proximal end adjoining the disk section and a distal end opposite to the proximal end and facing the ABS, wherein at least the distal end of the pin section has a non- rectangular cross section in a plane parallel to the ABS.
1. A near field transducer (NFT) for use in an energy assisted magnetic recording (EAMR) head, the NFT configured to direct energy to a recording media, the NFT comprising:
a disk section; and
a pin section extending towards an air bearing surface (ABS) from the disk section, the pin section having a proximal end adjoining the disk section and a distal end opposite to the proximal end and facing the ABS,
wherein the distal end of the pin section has a non-rectangular cross section in a plane parallel to the ABS and the proximal end of the pin section has a rectangular cross section in the plane parallel to the ABS.
2. The NFT of claim 1 , wherein at least the disk section comprises a material capable of supporting a surface-plasmon resonance in the disk section when subjected to the energy.
3. The NFT of claim 2 , where the material is selected from a group consisting of one or more of Au, Ag, Al, and Cu.
4. The NFT of claim 1 , wherein the pin section is configured to focus the energy into a spot on the recording media.
5. The NFT of claim 1 , wherein the non-rectangular cross section of the pin section is substantially uniform from the proximal end to the distal end.
6. The transducer of claim 1 , wherein non-rectangular cross-section is triangular.
7. The transducer of claim 6 , wherein a side of the triangular cross-section faces a pole structure of the EAMR head.
8. The transducer of claim 1 , wherein the non-rectangular cross section is trapezoidal.
9. The transducer of claim 8 , wherein a longer side of two parallel sides of the trapezoidal cross-section faces a pole structure of the EAMR head.
10. The transducer of claim 1 , wherein the non-rectangular cross section has a height in an along-track direction of between about 10 and 100 nm.
11. The transducer of claim 1 , wherein the non-rectangular cross section has a maximum width in a cross-track direction of between about 10 and 500 nm.