Patent ID: 9330691
Filing Date: 2016-05-03
CPC Classification: G11B

Claim Text:
1. A microwave assisted magnetic head comprising: a main pole; an auxiliary pole opposed to the main pole; a coil which magnetizes the main pole and the auxiliary pole; a spin torque oscillator provided between the main pole and the auxiliary pole; and a terminal which supply electricity to the spin torque oscillator, wherein the spin torque oscillator includes a spin injection layer formed on either the main pole or the auxiliary pole, an intermediate layer formed on the spin injection layer, and an oscillation layer formed on the intermediate layer, and a magnetization direction of the spin injection layer is identical regardless of polarity of a recording current if a driving current of the spin torque oscillator is zero, and the magnetization direction of the spin injection layer changes in response to the polarity of the recording current if the driving current of the spin torque oscillator is not zero.