Skyrmion pinball and directed motion on obstacle arrays
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/2399-6528/aba9fb http://hdl.handle.net/11449/199336 |
Resumo: | 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. |
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Skyrmion pinball and directed motion on obstacle arraysAc drivingPeriodic pinningSkyrmionWe 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Theoretical Division and Center for Nonlinear Studies Los Alamos National LaboratoryFaculdade de Ciências Universidade Estadual Paulista— UNESP, CP 473Departamento de Física Faculdade de Ciências Universidade Estadual Paulista—UNESP, CP 473Faculdade de Ciências Universidade Estadual Paulista— UNESP, CP 473Departamento de Física Faculdade de Ciências Universidade Estadual Paulista—UNESP, CP 473FAPESP: 2018/ 13198-7Los Alamos National LaboratoryUniversidade Estadual Paulista (Unesp)Vizarim, N. P. [UNESP]Reichhardt, C. J.O.Venegas, P. A. [UNESP]Reichhardt, C.2020-12-12T01:37:02Z2020-12-12T01:37:02Z2020-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1-20http://dx.doi.org/10.1088/2399-6528/aba9fbJournal of Physics Communications, v. 4, n. 8, p. 1-20, 2020.2399-6528http://hdl.handle.net/11449/19933610.1088/2399-6528/aba9fb2-s2.0-85090256071Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Physics Communicationsinfo:eu-repo/semantics/openAccess2021-10-23T07:14:39Zoai:repositorio.unesp.br:11449/199336Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T07:14:39Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Skyrmion pinball and directed motion on obstacle arrays |
title |
Skyrmion pinball and directed motion on obstacle arrays |
spellingShingle |
Skyrmion pinball and directed motion on obstacle arrays Vizarim, N. P. [UNESP] Ac driving Periodic pinning Skyrmion |
title_short |
Skyrmion pinball and directed motion on obstacle arrays |
title_full |
Skyrmion pinball and directed motion on obstacle arrays |
title_fullStr |
Skyrmion pinball and directed motion on obstacle arrays |
title_full_unstemmed |
Skyrmion pinball and directed motion on obstacle arrays |
title_sort |
Skyrmion pinball and directed motion on obstacle arrays |
author |
Vizarim, N. P. [UNESP] |
author_facet |
Vizarim, N. P. [UNESP] Reichhardt, C. J.O. Venegas, P. A. [UNESP] Reichhardt, C. |
author_role |
author |
author2 |
Reichhardt, C. J.O. Venegas, P. A. [UNESP] Reichhardt, C. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Los Alamos National Laboratory Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Vizarim, N. P. [UNESP] Reichhardt, C. J.O. Venegas, P. A. [UNESP] Reichhardt, C. |
dc.subject.por.fl_str_mv |
Ac driving Periodic pinning Skyrmion |
topic |
Ac driving Periodic pinning Skyrmion |
description |
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. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:37:02Z 2020-12-12T01:37:02Z 2020-01-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1088/2399-6528/aba9fb Journal of Physics Communications, v. 4, n. 8, p. 1-20, 2020. 2399-6528 http://hdl.handle.net/11449/199336 10.1088/2399-6528/aba9fb 2-s2.0-85090256071 |
url |
http://dx.doi.org/10.1088/2399-6528/aba9fb http://hdl.handle.net/11449/199336 |
identifier_str_mv |
Journal of Physics Communications, v. 4, n. 8, p. 1-20, 2020. 2399-6528 10.1088/2399-6528/aba9fb 2-s2.0-85090256071 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Physics Communications |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1-20 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799965300919107584 |