Extended spin torque oscillator

摘要

The present disclosure generally relates to a high-frequency oscillator for use in a recording device having a microwave-assisted magnetic recording head. The microwave-assisted magnetic recording head achieves a large assist effect by using an extended spin torque oscillator disposed between a main magnetic pole and a pole opposite the main magnetic pole. The spin torque oscillator obtains a strong high-frequency magnetic field and comprises a first non-magnetic spin scatterer, a reference layer, a first non-magnetic spin transfer layer, a first magnetic field generating layer, a second non-magnetic spin transfer layer, a second magnetic field generating layer, and a second non-magnetic spin scatterer. The spin torque oscillator has a drive current flowing though in the direction from the first magnetic field generating layer to the reference layer.

主权项

1. A microwave-assisted magnetic recording head, comprising:
a main magnetic pole; a magnetic pole opposite the main magnetic pole; and a spin torque oscillator disposed between the main magnetic pole and the magnetic pole opposite the main magnetic pole, wherein the spin torque oscillator is comprised of: a first non-magnetic spin scatterer in physical contact with either the main magnetic pole or the magnetic pole opposite the main magnetic pole, a reference layer in physical contact with the first non-magnetic spin scatterer, a first non-magnetic spin transfer layer in physical contact with the reference layer, a first magnetic field generating layer in physical contact with the first non-magnetic spin transfer layer, a second non-magnetic spin transfer layer in physical contact with the first magnetic field generating layer, a second magnetic field generating layer in physical contact with the second non-magnetic spin transfer layer, and a second non-magnetic spin scatterer in physical contact with the second magnetic field generating layer, wherein the second non-magnetic spin scatterer is in physical contact with either the main magnetic pole or the magnetic pole opposite the main magnetic pole, and wherein:
the first magnetic field generating layer is thicker than the second magnetic field generating layer; anda drive current flows in the direction from the first magnetic field generating layer to the reference layer.