US Patent 8395974 Thermally assisted magnetic recording head

A thermally-assisted magnetic recording head of the present invention includes waveguide 2 that includes core 3 through which light from a laser beam source propagates and cladding 4 that surrounds the periphery of the core 3, magnetic pole 10 that generates magnetic flux toward magnetic recording medium 25, plasmon generator 16 that faces a part of the core 3 and extends to the ABS, that couples to propagation light that propagates through the core 3 in a surface plasmon mode, and that generates surface plasmon, near-field light generating part 16a that is an end part of the plasmon generator on the ABS side and that generates near-field light from the surface plasmon, heat generation element 20 that thermally expands the thermally-assisted magnetic recording head, and dielectric body 40 that covers at least a part of the plasmon generator positioned on the ABS.