Emergence of Chaos in Magnetic-Field-Driven Skyrmions

TL;DR

This paper investigates how oscillating magnetic fields induce chaotic behavior in magnetic skyrmions, revealing complex nonlinear dynamics that could inform future chaos-based computing devices.

Contribution

It uncovers the nonlinear dynamic behaviors and chaos emergence in skyrmions driven by magnetic fields using micromagnetic simulations and bifurcation analysis.

Findings

Observation of hypotrochoidal motion patterns

Identification of bifurcation points leading to chaos

Guidelines for chaos computing with skyrmions

Abstract

We explore magnetic-field-driven chaos in magnetic skyrmions. Oscillating magnetic fields induce nonlinear dynamics in skyrmions, arising from the coupling of the secondary gyrotropic mode with a non-uniform, breathing-like mode. Through micromagnetic simulations, we observe complex patterns of hypotrochoidal motion in the orbital trajectories of the skyrmions, which are interpreted using bifurcation diagrams and local Lyapunov exponents. Our findings demonstrate that different nonlinear behaviors of skyrmions emerge at distinct temporal stages, depending on the nonlinear dynamic parameters. Investigating the abundant dynamic patterns of skyrmions during the emergence of chaos not only enhances device reliability but also provides useful guidelines for establishing chaos computing based on skyrmion dynamics.