Simulation of two-vortex spin-transfer nano-oscilators with maximum operating frequency

The influence of spin-polarized current and the thickness of magnetic layers on the coupled dynamics of vortices in small-diameter spin-transfer nanooscillators is studied. The nanooscillator has two magnetic permalloy layers (containing magnetic vortices), separated by a non-magnetic copper layer. Using analytical and numerical methods, the nonlinear dynamics of two magnetostatically coupled magnetic vortices under the influence of a spin-polarized electric current was studied. Numerical calculations of the dynamics of magnetostatically coupled vortices were carried out using the SpinPM micromagnetic modeling software package. Conditions have been found for obtaining a maximum frequency in such systems and increasing the range of currents in which a stationary mode of coupled vortex oscillations is observed. For the case of two identical magnetic layers, the possibility of the emergence of new scenarios of coupled vortex dynamics is shown.