Coating a near field transducer with a dielectric material from magnetic recording medium

A method to increase a signal to noise ratio of a heat assisted magnetic recording (HAMR) head, the method comprising:

• forming a liquid solution comprising at least a first dielectric and a disk surface lubricant;
• forming a coating of the liquid solution on an outer surface of a storage medium based at least in part on dipping the storage medium in the liquid solution;
• and
• accumulating a first set of molecules of the first dielectric on a near field transducer (NFT) of a HAMR head based at least in part on evaporating a first portion of the first dielectric in the coating by performing a first HAMR writing operation that shines a laser on the coating, the first set of molecules of the first dielectric having a refractive index n that ranges from about 1.1 to about 2.0 and an extinction coefficient k that ranges from about 0.0 to about 1.0 based at least in part on a material composition used for the first dielectric and a thickness of the first dielectric on the NFT.