Chaotic magnetization dynamics in magnetic Duffing oscillator

TL;DR

This paper introduces a magnetic analog of the Duffing oscillator, demonstrating how external magnetic fields and forces induce chaos in magnetization dynamics, bridging nonlinear dynamics and spintronics.

Contribution

It presents a novel magnetic Duffing oscillator model and analyzes how external magnetic fields control chaotic behaviors in ferromagnetic systems.

Findings

Chaotic behavior arises under periodic external forces.

External magnetic fields can control homoclinic orbits.

Chaos can be tuned by adjusting magnetic field parameters.

Abstract

We propose a magnetic analogy of the Duffing oscillator--magnetic Duffing oscillator--which is characterized by a double-well magnetic potential of a ferromagnet with a uniaxial magnetic anisotropy. Based on the linear stability analysis of the Landau-Lifshitz-Gilbert equation, we show that an external magnetic field applied perpendicular to the magnetic anisotropy field creates an anharmonicity on the magnetic potential, generating homoclinic orbits in the phase space. By evaluating the Lyapunov exponent, we demonstrate that the magnetic Duffing oscillator exhibits chaotic behaviors in the presence of periodically oscillating external forces: Oersted field and spin-orbit torque by considering the ferromagnet/heavy-metal bilayer. We also show that the external magnetic field can be adjusted to generate or modify homoclinic orbits, thereby controlling the parameter range of the oscillating external forces that induce chaos. This work deepens our understanding of chaotic magnetization dynamics by bridging the fields of nonlinear dynamics and spintronics.