Abstract
We show the possibility of high-frequency oscillations in a spin-torque oscillator that consists of an in-plane magnetized free and pinned layers in the presence of in-plane magnetic field by numerically solving the associated Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. We discover that frequency can be tuned significantly by tuning the direction of the in-plane magnetic field. Further, we observe the oscillation frequencies as high as 65 GHz for appropriate in-plane magnetic field angles. We also show the tunability of microwave frequency from ~15 GHz to ~68 GHz by tuning the magnitude of the direct current or the in-plane field angle and from ~35 GHz to ~65 GHz by varying the strength of the in-plane magnetic field. The power is proved to be enhanced by the in-plane field angle and current.
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