Near-field transducer having secondary atom higher concentration at bottom of the peg

A device comprising:

• a light source;
• a waveguide;
• and
• a near field transducer, the near field transducer comprising a peg and a disc, the peg having a region adjacent the ABS, the peg comprising:
• a plasmonic material selected from gold (Au), silver (Ag), copper (Cu), ruthenium (Ru), rhodium (Rh), aluminum (Al), or combinations thereof;
• and
• and at least one other secondary atom selected from germanium (Ge), tellurium (Te), aluminum (Al), antimony (Sb), tin (Sn), mercury (Hg), indium (In), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), silver (Ag), chromium (Cr), cobalt (Co), and combinations thereof,
• wherein a concentration of the secondary atom is higher at the region of the peg adjacent the ABS than a concentration of the secondary atom throughout the bulk of the peg and
• wherein the light source, waveguide and near field transducer are configured to transmit light from the light source to the waveguide and finally the near field transducer.