Patent ID: 8208219

Claim:
A method to enable a spin torque oscillator (STO) to generate microwaves at low current densities, near a perpendicular write pole, comprising: providing a non-magnetic spacer layer having parallel opposing first and second outer surfaces; disposing a field generation layer (FGL) to be in contact with said first outer surface, said FGL being a bilayer of first and second FGL sub-layers; said first FGL sub-layer being in full contact with said first outer surface as well as having an easy axis that is normal to said first outer surface; said second FGL sub-layer being in full contact with said first FGL sub-layer as well as having an easy axis that is parallel to said second outer surface; and disposing a spin injection layer (SIL) to be in full contact with said second outer surface as well as being permanently magnetized normal to said first and second outer surfaces, thereby enabling said STO to generate microwave radiation at low current densities.