Numerical analysis on the output frequency and power of a spin-torque nano-contact oscillator

Spin-torque nano-contact oscillators (STNOs) are nowadays the focus of much research, as they include fundamental physics and promising applications [1-3]. Among others, some studies noticed the occurrence of jumps in the output frequency of the STNO as the applied current or the external magnetic fi eld is varied [1,2]. This behavior was ascribed to the magnetization precession in the thicker fi xed layer of the device [1] or to the hopping between propagating and evanescent modes [2], nevertheless it cannot be considered fully explained.