Complex dynamics of dual vortex nano-oscillators mutually coupled via spin torques
Phys. Rev. B 114, 154417 – Published 18 September, 2026
DOI: https://doi.org/10.1103/6mk1-s9nc
Abstract
Spin-torque vortex oscillators (STVOs) have been shown to exhibit rich and complex dynamical regimes, which are strongly dependent on the configuration of the polarizer. Here, we give an overview of the dynamics in an STVO comprising two vortex free layers, where each layer serves as a dynamic polarizer for the other, increasing the number of degrees of freedom and, therefore, the complexity of the system. The dynamics are studied through extensive micromagnetic simulations, performed using our own implementation of the coupled equations of motion, implemented in the open-source micromagnetics code . We explore the roles of relative vortex configurations and layer asymmetry on the current-driven dynamics and find several complex regimes, including self-modulated gyration, the emergence of C-state dynamics, as well as chaotic transitions between regular gyration and this C state.
