Electric Current Control of Helimagnetic Chirality from a Multidomain State in the Helimagnet MnAu$_2$

TL;DR

This study investigates how electric currents influence magnetic domain chirality in MnAu$_2$, revealing low-threshold transitions between multidomain and single-chiral states and demonstrating high domain wall mobility.

Contribution

It provides new insights into electric current control of magnetic chirality and domain wall dynamics in helimagnets, supported by experimental and numerical analysis.

Findings

Low threshold current for multidomain to single-chiral transition

Chirality depends on magnetic field and current orientation

Numerical simulations match experimental results

Abstract

In this paper, we study the domain wall dynamics under electric current in the helimagnet MnAu$_2$. We have found that the threshold electric current of the transition from a multidomain state to a single-chiral domain state in a magnetic field is much lower than that of chirality reversal from a single-chiral domain within certain ranges of temperature and magnetic field. The chirality after the transition depends on whether the magnetic field and electric current were parallel or antiparallel. Numerical calculations based on the Landau-Lifshitz-Gilbert equation reproduced the experimental observations. These results indicate that the domain walls are highly mobile in the helimagnet.