Thermally assisted magnetic head assembly and magnetic disk device

A magnetic disk drive device, comprising:

• a thermally assisted magnetic head assembly including:
• a slider including a magnetic head part, an optical waveguide, and a near field element;
• and
• a submount on which a semiconductor laser and a mirror are mounted, the mirror being placed at one end of the semiconductor laser in a resonance direction thereof and reflecting a laser in a direction intersecting with the resonance direction,
• the slider and the submount being fixed to each other by first and second adhesives,
• the thermally assisted magnetic head assembly having a structure in which:
• at least parts of the first and second adhesives are applied to a position opposed to the semiconductor laser with an intermediation of the submount;
• and
• the first adhesive having a higher Young's modulus than that of the second adhesive is applied onto an inflow end side of the slider including a solder connection portion, the second adhesive being applied onto an outflow end side of the slider;
• a suspension having one end on which the thermally assisted magnetic head assembly is mounted;
• an arm connected to another end of the suspension;
• a drive part which drives the arm to a predetermined position;
• a magnetic disk on or from which data is recorded or reproduced by the magnetic head part and the near field element or by the magnetic head part;
• and
• a spindle motor which rotationally drives the magnetic disk at high speed.