Spin motive force by the momentum-space Berry phase in magnetic Weyl semimetals

TL;DR

This paper demonstrates that magnetic precession in noncentrosymmetric magnetic Weyl semimetals induces an electric current via a momentum-space Berry phase, revealing a novel topological spin motive force mechanism without magnetization gradients.

Contribution

It introduces a new mechanism for spin motive force driven by Berry phase effects in Weyl semimetals, distinct from traditional gradient-based methods.

Findings

Magnetic precession induces electric current through Berry phase in Weyl semimetals.

The mechanism operates without magnetization gradients, unlike conventional spin motive force.

Experimental signatures resemble spin motive force but with a topological origin.

Abstract

We show that the magnetic precession of ferromagnetic moments in a noncentrosymmetric magnetic Weyl semimetal induces an electric current through a mechanism analogous to the adiabatic charge pumping. The current is a consequence of a Berry phase in the momentum space resulting from the circular motion of Weyl nodes induced by the precession. This mechanism resembles the Faraday effect, namely, induced magnetic field by circular electric current. The circular motion of Weyl nodes induces magnetic charge current in the momentum space, which results in a Berry phase that describes the adiabatic pump. Experimentally, this phenomenon is similar to spin motive force, which is an electric current induced by magnetic precision in the presence of the spatial gradient of magnetization. However, unlike the conventional spin motive force, this current occurs without a magnetization gradient. The result demonstrates a nontrivial interplay between the topological electronic state and magnetic dynamics.