Patent ID: 7940486
Filing Date: 2011-05-10
Classification: G11B

Abstract:
1. A thermally assisted magnetic head comprising: a slider substrate having a medium-facing surface, a first surface located opposite to the medium-facing surface, and side surfaces located between the medium-facing surface and the first surface; a magnetic head portion having a core of a planar waveguide with a light exit face on the medium-facing surface side, and a magnetic recording element located in proximity to the light exit face, the magnetic head portion being fixed to one of the side surfaces; a light source support substrate having a second surface fixed to the first surface; and a light emitting element opposed to an exposed light entrance face of the core and fixed to the light source support substrate; wherein, where a thickness direction, a width direction, and a longitudinal direction of the core are defined as an X-axis, a Y-axis, and a Z-axis, respectively, where α is defined as a beam angle in the XY plane of a far field pattern of light emitted from the light emitting element, where Z where T is defined as a thickness of the core, the light emitted along the Z-axis from the light emitting element is incident to the exposed light entrance face, and a spot size w=2×Z