Skyrmion dynamics and topological sorting on periodic 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/10.1088/1367-2630/ab8045 http://hdl.handle.net/11449/198912 |
Resumo: | We examine skyrmions under a dc drive interacting with a square array of obstacles for varied obstacle size and damping. When the drive is applied in a fixed direction, we find that the skyrmions are initially guided in the drive direction but also move transverse to the drive due to the Magnus force. The skyrmion Hall angle, which indicates the difference between the skyrmion direction of motion and the drive direction, increases with drive in a series of quantized steps as a result of the locking of the skyrmion motion to specific symmetry directions of the obstacle array. On these steps, the skyrmions collide with an integer number of obstacles to create a periodic motion. The transitions between the different locking steps are associated with jumps or dips in the velocity-force curves. In some regimes, the skyrmion Hall angle is actually higher than the intrinsic skyrmion Hall angle that would appear in the absence of obstacles. In the limit of zero damping, the skyrmion Hall angle is 90°, and we find that it decreases as the damping increases. For multiple interacting skyrmion species in the collective regime, we find jammed behavior at low drives where the different skyrmion species are strongly coupled and move in the same direction. As the drive increases, the species decouple and each can lock to a different symmetry direction of the obstacle lattice, making it possible to perform topological sorting in analogy to the particle sorting methods used to fractionate different species of colloidal particles moving over two-dimensional obstacle arrays. |
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Skyrmion dynamics and topological sorting on periodic obstacle arraysdirectional lockingperiodic substratephase lockingskyrmionWe examine skyrmions under a dc drive interacting with a square array of obstacles for varied obstacle size and damping. When the drive is applied in a fixed direction, we find that the skyrmions are initially guided in the drive direction but also move transverse to the drive due to the Magnus force. The skyrmion Hall angle, which indicates the difference between the skyrmion direction of motion and the drive direction, increases with drive in a series of quantized steps as a result of the locking of the skyrmion motion to specific symmetry directions of the obstacle array. On these steps, the skyrmions collide with an integer number of obstacles to create a periodic motion. The transitions between the different locking steps are associated with jumps or dips in the velocity-force curves. In some regimes, the skyrmion Hall angle is actually higher than the intrinsic skyrmion Hall angle that would appear in the absence of obstacles. In the limit of zero damping, the skyrmion Hall angle is 90°, and we find that it decreases as the damping increases. For multiple interacting skyrmion species in the collective regime, we find jammed behavior at low drives where the different skyrmion species are strongly coupled and move in the same direction. As the drive increases, the species decouple and each can lock to a different symmetry direction of the obstacle lattice, making it possible to perform topological sorting in analogy to the particle sorting methods used to fractionate different species of colloidal particles moving over two-dimensional obstacle arrays.Theoretical Division and Center for Nonlinear Studies Los Alamos National LaboratoryPOSMAT - Programa de Pós-Graduacao em Ciencia e Tecnologia de Materiais Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473Departamento de Física Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473POSMAT - Programa de Pós-Graduacao em Ciencia e Tecnologia de Materiais Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473Departamento de Física Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473Los Alamos National LaboratoryUniversidade Estadual Paulista (Unesp)Vizarim, N. P. [UNESP]Reichhardt, C.Reichhardt, C. J.O.Venegas, P. A. [UNESP]2020-12-12T01:25:19Z2020-12-12T01:25:19Z2020-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1088/1367-2630/ab8045New Journal of Physics, v. 22, n. 5, 2020.1367-2630http://hdl.handle.net/11449/19891210.1088/1367-2630/ab80452-s2.0-85085686422Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNew Journal of Physicsinfo:eu-repo/semantics/openAccess2021-10-22T21:02:50Zoai:repositorio.unesp.br:11449/198912Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T21:02:50Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
title |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
spellingShingle |
Skyrmion dynamics and topological sorting on periodic obstacle arrays Vizarim, N. P. [UNESP] directional locking periodic substrate phase locking skyrmion |
title_short |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
title_full |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
title_fullStr |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
title_full_unstemmed |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
title_sort |
Skyrmion dynamics and topological sorting on periodic obstacle arrays |
author |
Vizarim, N. P. [UNESP] |
author_facet |
Vizarim, N. P. [UNESP] Reichhardt, C. Reichhardt, C. J.O. Venegas, P. A. [UNESP] |
author_role |
author |
author2 |
Reichhardt, C. Reichhardt, C. J.O. Venegas, P. A. [UNESP] |
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. Reichhardt, C. J.O. Venegas, P. A. [UNESP] |
dc.subject.por.fl_str_mv |
directional locking periodic substrate phase locking skyrmion |
topic |
directional locking periodic substrate phase locking skyrmion |
description |
We examine skyrmions under a dc drive interacting with a square array of obstacles for varied obstacle size and damping. When the drive is applied in a fixed direction, we find that the skyrmions are initially guided in the drive direction but also move transverse to the drive due to the Magnus force. The skyrmion Hall angle, which indicates the difference between the skyrmion direction of motion and the drive direction, increases with drive in a series of quantized steps as a result of the locking of the skyrmion motion to specific symmetry directions of the obstacle array. On these steps, the skyrmions collide with an integer number of obstacles to create a periodic motion. The transitions between the different locking steps are associated with jumps or dips in the velocity-force curves. In some regimes, the skyrmion Hall angle is actually higher than the intrinsic skyrmion Hall angle that would appear in the absence of obstacles. In the limit of zero damping, the skyrmion Hall angle is 90°, and we find that it decreases as the damping increases. For multiple interacting skyrmion species in the collective regime, we find jammed behavior at low drives where the different skyrmion species are strongly coupled and move in the same direction. As the drive increases, the species decouple and each can lock to a different symmetry direction of the obstacle lattice, making it possible to perform topological sorting in analogy to the particle sorting methods used to fractionate different species of colloidal particles moving over two-dimensional obstacle arrays. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:25:19Z 2020-12-12T01:25:19Z 2020-05-01 |
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/10.1088/1367-2630/ab8045 New Journal of Physics, v. 22, n. 5, 2020. 1367-2630 http://hdl.handle.net/11449/198912 10.1088/1367-2630/ab8045 2-s2.0-85085686422 |
url |
http://dx.doi.org/10.1088/1367-2630/ab8045 http://hdl.handle.net/11449/198912 |
identifier_str_mv |
New Journal of Physics, v. 22, n. 5, 2020. 1367-2630 10.1088/1367-2630/ab8045 2-s2.0-85085686422 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
New Journal of Physics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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_ |
1799965487464972288 |