English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using numerical simulations, we examine the nonlinear dynamics of skyrmionsdriven over random pinning. For weak pinning, the skyrmions depin elastically,retaining sixfold ordering; however, at the onset of motion there is a dip inthe magnitude of the structure factor peaks due to a decrease in positionalordering, indicating that the depinning transition can be detected using thestructure factor even within the elastic depinning regime. At higher drives themoving skyrmion lattice regains full ordering. For increasing pinning strength,we find a transition from elastic to plastic depinning that is accompanied by asharp increase in the depinning threshold due to the proliferation oftopological defects, similar to the peak effect found at the elastic to plasticdepinning transition in superconducting vortex systems. For strong pinning andstrong Magnus force, the skyrmions in the moving phase can form a stronglyclustered or phase separated state with highly modulated skyrmion density,similar to that recently observed in continuum-based simulations for strongdisorder. As the Magnus force is decreased, the density phase separated statecrosses over to a dynamically phase separated state with uniform density butwith flow localized in bands of motion, while in the strongly damped limit,both types of phase separated states are lost. In the strong pinning limit, wefind highly nonlinear velocity-force curves in the transverse and longitudinaldirections, along with distinct regions of negative differential conductivityin the plastic flow regime. The negative differential conductivity is absent inthe overdamped limit. The Magnus force is responsible for both the negativedifferential conductivity and the clustering effects, since it causes fastermoving skyrmions to partially rotate around slower moving or pinned skyrmions.

Nonlinear Transport, Dynamic Ordering, and Clustering for Driven Skyrmions on Random Pinning