Coherent sliding dynamics and spin motive force driven by crossed magnetic fields in chiral helimagnet

TL;DR

This paper demonstrates that applying crossed magnetic fields to a chiral helimagnet induces coherent sliding of the chiral soliton lattice, generating a strongly amplified spin-motive force proportional to the number of solitons.

Contribution

The study introduces a combined theoretical and numerical analysis of magnetic field-induced sliding dynamics and spin-motive-force generation in chiral soliton lattices.

Findings

Coherent sliding motion is induced by time-dependent magnetic fields.

Sliding velocity variation leads to a time-varying Berry phase.

Spin-motive-force is strongly amplified by the number of solitons.

Abstract

We demonstrated that the chiral soliton lattice formed out of a chiral helimagnet exhibits coherent sliding motion by applying a time-dependent magnetic field parallel to the helical axis, in addition to a static field perpendicular to the helical axis. To describe the coherent sliding, we use the collective coordinate method and numerical analysis. We also show that the time-dependent sliding velocity causes a time-varying Berry cap which causes the spin-motive-force. A salient feature of the chiral soliton lattice is appearance of the strongly amplified spin motive force which is directly proportional to the macroscopic number of solitons (magnetic kinks).