Patent ID: 7821732

Claim:
A thermally assisted magnetic head, comprising: a medium-facing surface; a main magnetic pole provided on the medium-facing surface; a plasmon antenna provided on the medium-facing surface, in the vicinity of the main magnetic pole, wherein the shape of the plasmon antenna, as viewed from a direction perpendicular to the medium-facing surface, is a triangle having first, second and third corners, the plasmon antenna being shaped as a flat plate the thickness direction of which is perpendicular to the medium-facing surface, and wherein, the distance from the first corner to the main magnetic pole is shorter than the distance from the second corner to the main magnetic pole and the distance from the third corner to the main magnetic pole, and the interior angle α of the first corner, the interior angle β of the second corner and the interior angle γ of the third corner satisfy relationships α<β, α<γ and β≠γ.