Patent ID: 8830800

Claim:
A device comprising: a magnetic structure, the magnetic structure having a substrate adjacent surface and a second, opposing surface, the magnetic structure comprising a near field transducer (NFT), wherein the NFT comprises gold or an alloy thereof, and is positioned at the second surface; an overcoat structure; and a film structure, the film structure positioned between the magnetic structure and the overcoat structure, the film structure having a total thickness of not greater than about 100 Å, and the film structure comprising: a first interfacial structure having a first and a second opposing surface; a second interfacial structure having a first and a second opposing surface; and an intermediate structure, wherein the first surface of the first interfacial structure is positioned adjacent the NFT of the magnetic structure, and the second surface of the second interfacial structure is positioned adjacent the overcoat structure, and the intermediate structure is positioned between the first interfacial structure and the second interfacial structure, and wherein the first interfacial structure comprises one or more rare earth elements, one or more alkaline earth metals, one or more alkali metals, or a combination thereof.