Chaotic dynamics in a macrospin spin-torque nano-oscillator with delayed feedback

TL;DR

This paper theoretically investigates how delayed feedback influences the dynamics of macrospin spin-torque nano-oscillators, revealing regimes like chaos and mode switching, with potential applications in information processing.

Contribution

It introduces a novel theoretical analysis of delayed feedback effects in macrospin spin-torque nano-oscillators, highlighting complex dynamical regimes.

Findings

Identification of chaos and mode switching regimes

Control of oscillations via delay and amplification

Potential for applications in information processing

Abstract

A theoretical study of delayed feedback in spin-torque nano-oscillators is presented. A macrospin geometry is considered, where self-sustained oscillations are made possible by spin transfer torques associated with spin currents flowing perpendicular to the film plane. By tuning the delay and amplification of the self-injected signal, we identify dynamical regimes in this system such as chaos, switching between precession modes with complex transients, and oscillator death. Such delayed feedback schemes open up a new field of exploration for such oscillators, where the complex transient states might find important applications in information processing.