# Current-Induced Dynamics and Chaos of Antiferromagnetic Bimerons

## TL;DR

This paper investigates the dynamics of antiferromagnetic bimerons driven by spin currents, revealing their creation, steady motion, nonlinear behavior, and chaos, which are crucial for future spintronic applications.

## Contribution

It provides the first analytical and numerical analysis of antiferromagnetic bimeron dynamics under spin currents, including chaotic behavior and nonlinear motion modeling.

## Key findings

- Spin current can create isolated bimerons in antiferromagnetic films.
- Antiferromagnetic bimerons can move steadily without transverse drift.
- Chaotic behavior of bimerons is characterized by Lyapunov exponents.

## Abstract

A magnetic bimeron is a topologically non-trivial spin texture carrying an integer topological charge, which can be regarded as the counterpart of skyrmion in easy-plane magnets. The controllable creation and manipulation of bimerons are crucial for practical applications based on topological spin textures. Here, we analytically and numerically study the dynamics of an antiferromagnetic bimeron driven by a spin current. Numerical simulations demonstrate that the spin current can create an isolated bimeron in the antiferromagnetic thin film via the damping-like spin torque. The spin current can also effectively drive the antiferromagnetic bimeron without a transverse drift. The steady motion of an antiferromagnetic bimeron is analytically derived and is in good agreement with the simulation results. Also, we find that the alternating-current-induced motion of the antiferromagnetic bimeron can be described by the Duffing equation due to the presence of the nonlinear boundary-induced force. The associated chaotic behavior of the bimeron is analyzed in terms of the Lyapunov exponents. Our results demonstrate the inertial dynamics of an antiferromagnetic bimeron, and may provide useful guidelines for building future bimeron-based spintronic devices.