Coupled breathing modes in one-dimensional Skyrmion lattices

TL;DR

This paper investigates the strong coupling and propagation of collective breathing modes in one-dimensional skyrmion lattices within thin-film nanostrips, revealing their potential for information processing applications.

Contribution

It demonstrates the existence of coupled breathing modes with characteristic dispersions and controllable propagation speeds in 1D skyrmion lattices, a novel insight into their dynamic behavior.

Findings

Coupled breathing modes show concave-down dispersion relations.

Propagation speeds of 200-700 m/s are achievable and controllable.

Band width increases as inter-skyrmion distance decreases.

Abstract

We explored strong coupling of dynamic breathing modes in one-dimensional (1D) skyrmion lattices periodically arranged in thin-film nanostrips. The coupled breathing modes exhibit characteristic concave-down dispersions that represent the in-phase high-energy mode at zero wavenumber (k=0) and the anti-phase low-energy mode at the Brillouin zone boundary (k=kBZ). The band width of the allowed modes increases with decreasing inter-distance between nearest-neighboring skyrmions. Furthermore, the collective breathing modes propagate very well through the thin-film nanostrips, as fast as 200 ~ 700 m/s, which propagation is controllable by the strength of magnetic fields applied perpendicularly to the film plane. The breathing modes in 1D skyrmion lattices potentially formed in such nanostrips possibly can be used as information carriers in information processing devices.