A special cross-tie domain wall in helimagnet

TL;DR

This paper reports the discovery of a unique cross-tie domain wall in the helimagnet MnCoSi alloy, characterized by large Bloch sub-walls and coexisting rotation axes, revealing complex magnetic structures and features.

Contribution

It introduces a novel special cross-tie domain wall with distinctive features in helimagnet MnCoSi, expanding understanding of magnetic domain structures.

Findings

Discovery of a new SCT domain wall in MnCoSi

Presence of large Bloch sub-walls within the SCT structure

Observation of various magnetic features like meron/antimeron chains

Abstract

A special cross-tie (SCT) domain wall was discovered in the helimagnet MnCoSi alloy via the magnetic vector field tomography in Lorentz transmission electron microscopy (LTEM). Different to the traditional cross-tie (TCT) domain wall where the convergent/divergent magnetic moment configuration line up one by one, the relative large Bloch type sub-walls emerge in this brand-new SCT domain wall and two mutually perpendicular rotation axes coexist in this special feature. The straight magnetic stripes accompanied with the unraveled domain walls hint the complex mechanism to form this SCT structure. Interestingly, different orientation of this domain wall in LTEM can easily exhibit various magnetic features, including meron/antimeron chains or bimeron strings.