Theory of Electromotive Force Induced by Domain Wall Motion

TL;DR

This paper develops a theoretical framework describing how moving magnetic textures in ferromagnets induce electromotive forces on conduction electrons, with universal results for domain wall-induced emf useful for characterizing magnetic dynamics.

Contribution

It introduces a novel theory linking magnetic texture dynamics to topological fields and emf generation, providing universal predictions for domain wall motion effects.

Findings

Universal emf formulas for transverse and vortex domain walls

Topological fields cause electromotive forces in ferromagnetic materials

Measurement of emf can characterize domain wall motion

Abstract

We formulate a theory on the dynamics of conduction electrons in the presence of moving magnetic textures in ferromagnetic materials. We show that the variation of local magnetization in both space and time gives rise to topological fields, which induce electromotive forces on the electrons. Universal results are obtained for the emf induced by both transverse and vortex domain walls traveling in a magnetic film strip, and their measurement may provide clear characterization on the motion of such walls.