Patent ID: 8654480

Claim:
A magnetic head comprising: a recording magnetic pole to generate a recording magnetic field; a spin torque oscillator formed in the vicinity of the recording magnetic pole, the spin torque oscillator including: a magnetic layer comprising at least one magnetic film; a bias layer; an intermediate layer between the magnetic layer and the bias layer; an oscillation layer between the bias layer and the intermediate layer; and an electrode comprising a first electrode layer on a face of the magnetic layer on a side thereof opposite from the intermediate layer and between the magnetic layer and the recording magnetic pole, and a second electrode layer on a face of the bias layer on a side thereof opposite from the intermediate layer, the electrode being capable of applying a current flowing in a direction perpendicular to film planes of the magnetic layer, the intermediate layer, the oscillation layer, and the bias layer, the first electrode layer, the magnetic layer, the intermediate layer, the oscillation layer, the bias layer, and the second electrode layer being stacked in a direction from the recording magnetic pole to the first electrode layer, a hard bias film provided at both end portions of the bias layer and the oscillation layer in a direction perpendicular to a direction parallel to a line connecting the recording magnetic pole and the spin torque oscillator in a plane parallel to an air bearing surface, the hard bias film configured to apply a magnetic field to only the bias layer and the oscillation layer.