# Skyrmions Driven by Intrinsic Magnons

## TL;DR

This paper investigates how oscillating magnetic fields influence skyrmion motion in magnetic insulators, revealing a resonance-driven unidirectional propagation due to magnon interactions.

## Contribution

It introduces a quantum field theory model showing how ac magnetic fields induce skyrmion motion via intrinsic magnons, including dissipation effects and resonance phenomena.

## Key findings

- Resonant ac fields cause unidirectional skyrmion movement.
- Magnetic ac fields induce a transition from super-Ohmic to Ohmic dissipation.
- Magnon coupling leads to novel skyrmion dynamics in nanowires.

## Abstract

We study the dynamics of a skyrmion in a magnetic insulating nanowire in the presence of time-dependent oscillating magnetic field gradients. These ac fields act as a net driving force on the skyrmion via its own intrinsic magnetic excitations. In a microscopic quantum field theory approach we include the unavoidable coupling of the external field to the magnons, which gives rise to time-dependent dissipation for the skyrmion. We demonstrate that the magnetic ac field induces a super-Ohmic to Ohmic crossover behavior for the skyrmion dissipation kernels with time-dependent Ohmic terms. The ac driving of the magnon bath at resonance results in a unidirectional helical propagation of the skyrmion in addition to the otherwise periodic bounded motion.