Near-field transducer dielectric wrap for reducing heat

An apparatus, comprising:

• a write pole;
• a waveguide core;
• a near-field transducer (NFT) positioned between the write pole and the waveguide core, the NFT comprising a heatsink portion, an enlarged portion, and a peg comprising a refractory metal and extending from the enlarged portion toward a media-facing surface, wherein a first surface of the peg is substantially coplanar with a first surface of the enlarged portion and the first surface of the enlarged portion shares an interface with the heatsink portion;
• a first dielectric layer positioned between the NFT and the write pole;
• and
• a second dielectric layer positioned between the waveguide core and the enlarged portion and peg of the NFT, wherein at least the second dielectric layer has a refractive index less than 1.5.

An apparatus, comprising:

• a write pole;
• a waveguide core;
• a near-field transducer (NFT) positioned between the write pole and the waveguide core, the NFT comprising a heatsink portion, an enlarged portion, and a peg comprising a refractory metal and extending from the enlarged portion toward a media-facing surface, wherein a first surface of the peg is substantially coplanar with a first surface of the enlarged portion and the first surface of the enlarged portion shares an interface with the heatsink portion;
• a first dielectric layer positioned between the peg and the write pole;
• and
• a second dielectric layer positioned between the NFT and the waveguide core, wherein the second dielectric layer comprises a bi-layer structure having a first dielectric material proximate the peg and a second dielectric material proximate the waveguide core, wherein at least the first dielectric material has a refractive index less than 1.5.