Emergence of electromotive force in precession-less rigid motion of deformed domain wall

TL;DR

This paper reveals that a deformed domain wall's rigid motion can induce electromotive force through a topological pumping mechanism, especially influenced by the wall's bulging, challenging previous assumptions.

Contribution

It introduces the novel idea that deformed domain wall motion can generate electromotive force without precession, expanding understanding of topological pumping effects.

Findings

Electromotive force depends on domain wall bulging.

Deformed domain wall motion induces emf along and normal to motion.

Rigid motion of a deformed DW can generate emf, contrary to prior beliefs.

Abstract

Recently it has been recognized that the electromotive force (emf) can be induced just by the spin precession where the generation of the electromotive force has been considered as a real-space topological pumping effect. It has been shown that the amount of the electromotive force is independent of the functionality of the localized moments. It was also demonstrated that the rigid domain wall (DW) motion cannot generate electromotive force in the system. Based on real-space topological pumping approach in the current study we show that the electromotive force can be induced by rigid motion of a deformed DW. We also demonstrate that the generated electromotive force strongly depends on the DW bulging. Meanwhile results show that the DW bulging leads to generation of the electromotive force both along the axis of the DW motion and normal to the direction of motion.