Manipulation of Magnetic Solitons on Odd-Numbered Macrospin Rings

TL;DR

This paper demonstrates how a carefully tuned rotating magnetic field can induce unidirectional propagation of magnetic solitons in a frustrated macrospin ring, with potential applications in rotation counting and robustness against disorder.

Contribution

It introduces a simulation of a frustrated odd-numbered macrospin ring system with dipolar interactions, showing controlled soliton propagation and robustness to disorder.

Findings

Successful unidirectional soliton propagation achieved

System remains robust under quenched disorder

Potential application as a rotation counter

Abstract

We report simulations of a frustrated odd-numbered macrospin ring system, with full point dipolar interactions, driven by a rotating uniform applied magnetic field of constant magnitude. The system is designed with equally-spaced radially-aligned macrospins, which must carry a frustrated soliton defect in its ground state. It is shown how correctly tuning the applied field magnitude can allow for non-trivial unidirectional propagation of the soliton, the required directional pressure acquired via the curvature of the ring. Furthermore, the system, which may be employed as a multiple rotation counter, is tested for robustness against quenched disorder as would be present in an experimental realization.