Torsion-induced Dzyaloshinskii-Moriya interaction in helical magnets

TL;DR

This paper investigates how torsion can induce Dzyaloshinskii-Moriya interactions in helical magnets, providing a microscopic mechanism, estimating the interaction strength, and proposing experimental observation methods.

Contribution

It introduces a microscopic mechanism for torsion-induced Dzyaloshinskii-Moriya interaction and suggests ways to observe its effects in helimagnets.

Findings

Torsion can induce Dzyaloshinskii-Moriya interaction in magnets with inversion symmetry.

The paper estimates the magnitude of the torsion-induced DMI constant.

A method for experimental detection of torsion-induced effects is proposed.

Abstract

It has been shown that in magnets possessing an inversion center in the absence of deformations, a torsion-induced Dzyaloshinsky-Moriya interaction (tiDMI) can arise. A microscopic mechanism for this interaction is described, involving the transfer of angular momentum to the lattice upon electron reflection from the magnet's boundary. An estimate of the tiDMI constant is provided. It is demonstrated that tiDMI can lift the chiral degeneracy in helimagnets, and a way for experimentally observing this effect is proposed.