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Nonequilibrium phases and segregation for skyrmions on periodic pinning arrays

Journal Article · · Physical Review B
 [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Using particle-based simulations, we examine the collective dynamics of skyrmions interacting with periodic pinning arrays, focusing on the impact of the Magnus force on the sliding phases. As a function of increasing pinning strength, we find a series of distinct dynamical phases, including an interstitial flow phase, a moving disordered state, a moving crystal, and a segregated cluster state. The transitions between these states produce signatures in the skyrmion lattice structure, the skyrmion Hall angle, the velocity fluctuation distributions, and the velocity-force curves. The moving clustered state is similar to the segregated state recently observed in continuum-based simulations with strong quenched disorder. The segregation arises from the drive dependence of the skyrmion Hall angle, and appears in the strong pinning limit when the skyrmions have nonuniform velocities, causing different portions of the sample to have different effective skyrmion Hall angles. As a result, we map the evolution of the dynamic phases as a function of the system density, the ratio of the Magnus force to the dissipative term, and the ratio of the number of skyrmions to the number of pinning sites.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396
OSTI ID:
1482952
Alternate ID(s):
OSTI ID: 1768530
OSTI ID: 1477560
Report Number(s):
LA-UR--18-27075; LA-UR--18-30677
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 13 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Skyrmion relaxation dynamics in the presence of quenched disorder journal July 2019
Collective transport properties of skyrmions on the depinning phase transition journal August 2019
Braiding Majorana fermions and creating quantum logic gates with vortices on a periodic pinning structure journal January 2020
Nonlinear transport, dynamic ordering, and clustering for driven skyrmions on random pinning journal March 2019
Nonequilibrium charge transport through Falicov-Kimball structures connected to metallic leads journal April 2019
Nonequilibrium charge transport through Falicov-Kimball structures connected to metallic leads text January 2018

Figures / Tables (26)

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TABLE I(p. 15)table TABLE I

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Material Science