Theory of magnon motive force in chiral ferromagnets

TL;DR

This paper predicts that magnon motive forces cause temperature-dependent, nonlinear chiral damping in ferromagnets, significantly affecting skyrmion and domain wall dynamics and inducing large transverse spin and energy currents.

Contribution

It introduces a theoretical framework for magnon motive force effects on chiral damping and spin currents in ferromagnets, highlighting temperature dependence and nonlinear behavior.

Findings

Magnon motive force causes nonlinear chiral damping.

Chiral damping influences skyrmion and domain wall motion.

Large transverse spin and energy currents can be induced.

Abstract

We predict that magnon motive force can lead to temperature dependent, nonlinear chiral damping in both conducting and insulating ferromagnets. We estimate that this damping can significantly influence the motion of skyrmions and domain walls at finite temperatures. We also find that in systems with low Gilbert damping moving chiral magnetic textures and resulting magnon motive forces can induce large spin and energy currents in the transverse direction.