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Title: Shapiro steps for skyrmion motion on a washboard potential with longitudinal and transverse ac drives

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics

In this work, we numerically study the behavior of two-dimensional skyrmions in the presence of a quasi-one-dimensional sinusoidal substrate under the influence of externally applied dc and ac drives. In the overdamped limit, when both dc and ac drives are aligned in the longitudinal direction parallel to the direction of the substrate modulation, the velocity-force curves exhibit classic Shapiro step features when the frequency of the ac drive matches the washboard frequency that is dynamically generated by the motion of the skyrmions over the substrate, similar to previous observations in superconducting vortex systems. In the case of skyrmions, the additional contribution to the skyrmion motion from a nondissipative Magnus force shifts the location of the locking steps to higher dc drives, and we find that the skyrmions move at an angle with respect to the direction of the dc drive. For a longitudinal dc drive and a perpendicular or transverse ac drive, the overdamped system exhibits no Shapiro steps; however, when a finite Magnus force is present, we find pronounced transverse Shapiro steps along with complex two-dimensional periodic orbits of the skyrmions in the phase-locked regimes. Both the longitudinal and transverse ac drives produce locking steps whose widths oscillate with increasing ac drive amplitude. We examine the role of collective skyrmion interactions and find that additional fractional locking steps occur for both longitudinal and transverse ac drives. Finally, at higher skyrmion densities, the system undergoes a series of dynamical order-disorder transitions, with the skyrmions forming a moving solid on the phase locking steps and a fluctuating dynamical liquid in regimes between the steps.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1457250
Alternate ID(s):
OSTI ID: 1234021
Report Number(s):
LA-UR-15-25180; PRBMDO; TRN: US1901333
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 22; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Huygens's clocks
  • Bennett, Matthew; Schatz, Michael F.; Rockwood, Heidi
  • Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 458, Issue 2019 https://doi.org/10.1098/rspa.2001.0888
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Cited By (9)

Coupling of the skyrmion velocity to its breathing mode in periodically notched nanotracks journal November 2018
Depinning and nonequilibrium dynamic phases of particle assemblies driven over random and ordered substrates: a review journal December 2016
Noise fluctuations and drive dependence of the skyrmion Hall effect in disordered systems journal September 2016
Motion of skyrmions in nanowires driven by magnonic momentum-transfer forces journal June 2017
Chiral edge currents for ac-driven skyrmions in confined pinning geometries journal November 2019
Devil's staircase and the absence of chaos in the dc- and ac-driven overdamped Frenkel-Kontorova model journal August 2017
Magnus-Induced Dynamics of Driven Skyrmions on a Quasi-One-Dimensional Periodic Substrate text January 2016
Motion of skyrmions in nanowires driven by magnonic momentum-transfer forces text January 2017
Chiral Edge Currents for ac Driven Skyrmions in Confined Pinning Geometries text January 2019

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