Shapiro spikes and negative mobility for skyrmion motion on quasi-one-dimensional periodic substrates

C. Reichhardt and C. J. Olson Reichhardt
Phys. Rev. B 95, 014412 – Published 12 January 2017

Abstract

Using a simple numerical model of skyrmions in a two-dimensional system interacting with a quasi-one-dimensional periodic substrate under combined dc and ac drives where the dc drive is applied perpendicular to the substrate periodicity, we show that a rich variety of novel phase-locking dynamics can occur due to the influence of the Magnus term on the skyrmion dynamics. Instead of Shapiro steps, the velocity response in the direction of the dc drive exhibits a series of spikes, including extended dc drive intervals over which the skyrmions move in the direction opposite to the dc drive, producing negative mobility. There are also specific dc drive values at which the skyrmions move exactly perpendicular to the dc drive direction, giving a condition of absolute transverse mobility.

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  • Received 29 June 2016
  • Revised 16 November 2016

DOI:https://doi.org/10.1103/PhysRevB.95.014412

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

C. Reichhardt and C. J. Olson Reichhardt

  • Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 95, Iss. 1 — 1 January 2017

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