Skyrmion pinball and directed motion on obstacle arrays
Abstract
Abstract We examine skyrmions interacting with a square array of obstacles under ac drives applied in one or two directions. For a single direction of ac driving, we find that the Magnus force in conjunction with the obstacle interactions can create elliptical skyrmion orbits of increasing size, leading to localized phases, chaotic phases, and translating or ratcheting orbits. Under two ac drives that are out of phase by 90° and applied in two directions, the skyrmions form localized commensurate orbits that encircle an integer number of obstacles, similar to the electron pinball effect observed for electrons in antidot lattices. As a function of ac amplitude, Magnus force strength, and obstacle size, we find that chaotic scattering regimes and directed motion can emerge even in the absence of asymmetry in the substrate. The directed motion follows different symmetry axes of the periodic substrate, and we observe a variety of reversed ratchet effects. The Magnus force in the skyrmion system produces a significantly larger number of directed motion regimes than are exhibited by overdamped systems. We discuss how these results could be used to move skyrmions in a controlled way for possible applications.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); São Paulo Research Foundation (FAPESP)
- OSTI Identifier:
- 1646550
- Alternate Identifier(s):
- OSTI ID: 1864990
- Report Number(s):
- LA-UR-20-23086
Journal ID: ISSN 2399-6528
- Grant/Contract Number:
- 89233218CNA000001; 2018/13198-7
- Resource Type:
- Published Article
- Journal Name:
- Journal of Physics Communications
- Additional Journal Information:
- Journal Name: Journal of Physics Communications Journal Volume: 4 Journal Issue: 8; Journal ID: ISSN 2399-6528
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 97 MATHEMATICS AND COMPUTING; mathematics; skyrmion; periodic pinning; ac driving
Citation Formats
Vizarim, N. P., Reichhardt, C. J. O., Venegas, P. A., and Reichhardt, C. Skyrmion pinball and directed motion on obstacle arrays. United Kingdom: N. p., 2020.
Web. doi:10.1088/2399-6528/aba9fb.
Vizarim, N. P., Reichhardt, C. J. O., Venegas, P. A., & Reichhardt, C. Skyrmion pinball and directed motion on obstacle arrays. United Kingdom. https://doi.org/10.1088/2399-6528/aba9fb
Vizarim, N. P., Reichhardt, C. J. O., Venegas, P. A., and Reichhardt, C. Thu .
"Skyrmion pinball and directed motion on obstacle arrays". United Kingdom. https://doi.org/10.1088/2399-6528/aba9fb.
@article{osti_1646550,
title = {Skyrmion pinball and directed motion on obstacle arrays},
author = {Vizarim, N. P. and Reichhardt, C. J. O. and Venegas, P. A. and Reichhardt, C.},
abstractNote = {Abstract We examine skyrmions interacting with a square array of obstacles under ac drives applied in one or two directions. For a single direction of ac driving, we find that the Magnus force in conjunction with the obstacle interactions can create elliptical skyrmion orbits of increasing size, leading to localized phases, chaotic phases, and translating or ratcheting orbits. Under two ac drives that are out of phase by 90° and applied in two directions, the skyrmions form localized commensurate orbits that encircle an integer number of obstacles, similar to the electron pinball effect observed for electrons in antidot lattices. As a function of ac amplitude, Magnus force strength, and obstacle size, we find that chaotic scattering regimes and directed motion can emerge even in the absence of asymmetry in the substrate. The directed motion follows different symmetry axes of the periodic substrate, and we observe a variety of reversed ratchet effects. The Magnus force in the skyrmion system produces a significantly larger number of directed motion regimes than are exhibited by overdamped systems. We discuss how these results could be used to move skyrmions in a controlled way for possible applications.},
doi = {10.1088/2399-6528/aba9fb},
journal = {Journal of Physics Communications},
number = 8,
volume = 4,
place = {United Kingdom},
year = {Thu Aug 06 00:00:00 EDT 2020},
month = {Thu Aug 06 00:00:00 EDT 2020}
}
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