| 主权项 |
1. A thermally-assisted magnetic recording head comprising:
a medium facing surface configured to face a recording medium; a coil for producing a magnetic field corresponding to data to be written on the recording medium; a main pole having a front end face located in the medium facing surface; a waveguide including a core and a cladding, the core allowing light to propagate therethrough, the cladding being provided around the core; and a plasmon generator having a near-field light generating surface located in the medium facing surface, wherein the main pole is configured to pass a magnetic flux corresponding to the magnetic field produced by the coil, and to produce from the front end face a write magnetic field for writing the data on the recording medium, the plasmon generator is configured to excite a surface plasmon on the plasmon generator based on the light propagating through the core, and to generate near-field light from the near-field light generating surface based on the surface plasmon, the front end face of the main pole and the near-field light generating surface are at locations different from each other in a direction of travel of the recording medium, the front end face of the main pole includes a first end face portion, and a second end face portion contiguous with the first end face portion, the second end face portion is located farther from the near-field light generating surface than is the first end face portion, and is greater than the first end face portion in width in a track width direction, the first end face portion has a first edge and a second edge opposite to each other in the track width direction, the near-field light generating surface is rectangular, and has a third edge and a fourth edge opposite to each other in the track width direction, the first edge and the third edge are located on a first imaginary straight line, and the second edge and the fourth edge are located on a second imaginary straight line parallel to the first imaginary straight line. |
