Patent ID: 8724262
Filing Date: 2014-05-13
Classification: G11B

Abstract:
1. A magnetic head comprising: a main magnetic pole configured to apply a recording magnetic field to a magnetic recording medium; an auxiliary magnetic pole configured to form a magnetic circuit together with the main magnetic pole; a spin torque oscillation element formed between the main magnetic pole and the auxiliary magnetic pole; and a filling layer formed on side of the spin torque oscillation element between the main magnetic pole and the auxiliary magnetic pole, wherein the spin torque oscillation element includes a spin injection layer formed on one of the main magnetic pole and the auxiliary magnetic pole, a nonmagnetic interlayer formed on the spin injection layer, and an oscillation layer formed on the nonmagnetic interlayer, the filling layer is divided into an insulator region and a metal region from a first interface as a boundary, and the first interface is positioned on a side surface of the oscillation layer, and the insulator region is formed from a side of the spin injection layer to a side of the nonmagnetic interlayer and to a side of one portion of the oscillation layer, the metal region is formed on a side of the other portion of the oscillation layer, and a difference Δt between a position of the first interface and a position of a second interface between the nonmagnetic interlayer and the oscillation layer is not less than 0.5 nm.