Spin Hall torque magnetometry of Dzyaloshinskii domain walls

TL;DR

This paper investigates how the Dzyaloshinskii-Moriya interaction influences current-induced domain wall motion in heavy-metal/ferromagnet bilayers, revealing strong material-dependent effects and wall distortions relevant for spintronics.

Contribution

It provides a combined experimental and theoretical analysis of Dzyaloshinskii domain walls, quantifying DMI strength variations and their impact on domain wall structure.

Findings

DMI strength varies by a factor of 20 between Ta and Pa

Strong DMI causes unique wall distortions

Angular dependence of torque and magnetization structure characterized

Abstract

Current-induced domain wall motion in the presence of the Dzyaloshinskii-Moriya interaction (DMI) is experimentally and theoretically investigated in heavy-metal/ferromagnet bilayers. The angular dependence of the current-induced torque and the magnetization structure of Dzyaloshinskii domain walls are described and quantified simultaneously in the presence of in-plane fields. We show that the DMI strength depends strongly on the heavy metal, varying by a factor of 20 between Ta and Pa, and that strong DMI leads to wall distortions not seen in conventional materials. These findings provide essential insights for understanding and exploiting chiral magnetism for emerging spintronics applications.