Spin-transfer-driven nano-oscillators are equivalent to parametric resonators

TL;DR

This paper shows that spin-transfer-driven nano-oscillators can be modeled as parametric resonators, enabling better understanding and prediction of their magnetic states and dynamics through this equivalence.

Contribution

It establishes a theoretical equivalence between spin-transfer nano-oscillators and parametric resonators, facilitating analysis of their phases and behaviors.

Findings

Predicted magnetic states such as solitons and textures.

Confirmed dynamical behaviors through numerical simulations.

Provided phase diagrams for the system.

Abstract

The equivalence between different physical systems permits us to transfer knowledge between them and to characterize the universal nature of their dynamics. We demonstrate that a nanopillar driven by a spin-transfer torque is equivalent to a rotating magnetic plate, which permits us to consider the nanopillar as a macroscopic system under a time-modulated injection of energy, that is, a simple parametric resonator. This equivalence allows us to characterize the phases diagram and to predict magnetic states and dynamical behaviors, such as solitons, stationary textures, and oscillatory localized states, among others. Numerical simulations confirm these predictions.