Simulating Thiele's Equation and Collective Skyrmion Dynamics in Circuit Networks

TL;DR

This paper demonstrates how electrical circuits can simulate Thiele's equation and collective skyrmion dynamics, enabling experimental observation of phenomena like the skyrmion Hall effect, frequency combs, and topological edge states.

Contribution

It introduces a circuit-based simulation platform for magnetic textures, allowing experimental exploration of complex skyrmion phenomena and topological states.

Findings

Observation of the skyrmion Hall effect in circuits

Emergence of frequency combs under strong pumping

Experimental confirmation of topological solitonic insulators

Abstract

Developed half a century ago, Thiele's equation has played a crucial role in describing the motion of magnetic textures, ranging from simple magnetic domains to exotic magnetic solitons like skyrmions and hopfions. However, it remains a challenge to fully understand the collective dynamics of magnetic texture crystals, due to the complex many-body interactions. On the other hand, electrical circuits have recently been proved to be a powerful platform to realize rich physical phenomena in solids. In this Letter, we first construct a circuit unit to simulate Thiele's equation, which enables us to experimentally observe the "skyrmion Hall effect". By coupling a pair of such circuit units, we find an emerging frequency comb under strong pumpings, a long-sought nonlinear effect in interacting skyrmion systems. By extending our strategy to circuit arrays, we experimentally observe the topological edge state, thus confirming the theoretical prediction of topological solitonic insulators years ago. Our work builds a faithful connection between electric circuits and magnetic solitons, two seemingly unrelated areas, and opens the door for exploring collective magnetization dynamics in circuit networks.