The noise-induced frequency shift in spin-torque oscillators

In the report the dependence of mean angular frequency in spin-torque nano-oscillators (STNO) on the intensity of external magnetic field fluctuations and other parameters is analyzed. Using the analytical expression for polar angle distribution and numerical simulations it is shown that the deviation of mean frequency can be considerable and always increase with the approach to the boundaries of oscillation regime. It is also shown that this effect starts to disappear when the correlation time of noise becomes greater than the inverse angular frequency. This last phenomenon leads to the asymmetry of the dependence of mean angular frequency deviations from the parameters of the STNO for non-white noise.