Self-Oscillation in Spin Torque Oscillator Stabilized by Field-like   Torque
  The self-oscillation of the magnetization in a spin torque oscillator (STO) with a perpendicularly magnetized free layer and an in-plane magnetized pinned layer in the absence of an applied magnetic field was studied by numerically solving the Landau-Lifshitz-Gilbert equation. It was pointed out that field-like torque was necessary to realize stable self-oscillation in this type of STO at zero field. The numerical simulation at finite temperature showed that the presence of the field-like torque led to a high power with a relatively high oscillation frequency. 
Tomohiro Taniguchi, Sumito Tsunegi, Hitoshi Kubota, Hiroshi Imamura
cond-mat.mes-hall