Patent ID: 8588040

Claim:
A thermally assisted magnetic head slider, comprising: a substrate having a light source module mounted thereon and an air bearing surface facing to a magnetic recording medium surface; a read portion having a read element; and a write portion comprising a write element, a waveguide for guiding light generated by the light source module, and a plasmon unit provided around the write element and the waveguide and having a near-field light generating surface for propagating near-field light to the air bearing surface; wherein a first coat layer with a first thickness which has a first light absorption index is covered on an opposed-to-medium surface of the read portion, and a second coat layer with a second thickness which has a second light absorption index is covered on an opposed-to medium surface of the write portion, wherein the second thickness is larger than the first thickness, and the second light absorption index is smaller than the first light absorption index.