Modification of Dzyaloshinskii-Moriya interaction stabilized domain wall chirality by driving currents

TL;DR

This paper investigates how electrical currents influence the Dzyaloshinskii-Moriya interaction (DMI) and domain wall chirality in multilayer magnetic structures, revealing a current-induced modification of DMI that affects magnetic textures.

Contribution

It provides experimental evidence of current-induced changes in DMI and domain wall chirality, expanding understanding of current effects on magnetic interactions in multilayers.

Findings

Current-induced domain wall motion alters effective DMI magnitude.

Opposite domain wall chirality observed under current versus field.

Possible theoretical explanations for current-induced DMI effects discussed.

Abstract

We measure and analyze the chirality of the Dzyaloshinskii-Moriya interaction (DMI) stabilized spin textures in multilayers of Ta/Co$_{20}$Fe$_{60}$B$_{20}$/MgO. The effective DMI is measured experimentally using domain wall motion measurements, both in the presence (using spin orbit torques) and absence of driving currents (using magnetic fields). We observe that the current-induced domain wall motion yields a change in effective DMI magnitude and opposite domain wall chirality when compared to field-induced domain wall motion (without current). We explore this effect, which we refer to as current-induced DMI, by providing possible explanations for its emergence, and explore the possibilty of its manifestation in the framework of recent theoretical predictions of DMI modifications due to spin currents.