Spin-motive force due to domain wall motion in the presence of Dzyaloshinskii-Moriya Interaction

TL;DR

This paper theoretically shows that Dzyaloshinskii-Moriya Interaction (DMI) can significantly enhance the spin-motive force generated by domain wall motion, especially at low external magnetic fields.

Contribution

It provides a theoretical derivation demonstrating how DMI amplifies spin-motive force during domain wall motion, with quantitative analysis of field and DMI effects.

Findings

SMF can be increased by up to ten times with DMI

Enhancement occurs mainly in low magnetic field regimes

Derived explicit expression for SMF dependence on DMI and field

Abstract

We theoretically demonstrate that the presence of Dzyaloshinskii-Moriya Interaction (DMI) can lead to enhancement of the spin-motive force (SMF) arising due to field-induced ferromagnetic domain wall motion. A SMF refers to an electric voltage induced by dynamical magnetic textures, which reflects the temporal and spatial variations of the magnetization. A DMI can introduce extra spatial rotation of the magnetization in the domain wall region, which turns out to cause the enhancement of the SMF. We derive an expression for the SMF, and examine the field- and DMI-dependences of the SMF. We find that the SMF can be amplified by up to an order of magnitude in the low field regime, where the external field is lower than the so-called Walker breakdown field.