Clogging, diode and collective effects of skyrmions in funnel geometries
Autor(a) principal: | |
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Data de Publicação: | 2022 |
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/ac9749 http://hdl.handle.net/11449/246193 |
Resumo: | Using a particle-based model, we examine the collective dynamics of skyrmions interacting with a funnel potential under dc driving as the skyrmion density and relative strength of the Magnus and damping terms are varied. For driving in the easy direction, we find that increasing the skyrmion density reduces the average skyrmion velocity due to jamming of skyrmions near the funnel opening, while the Magnus force causes skyrmions to accumulate on one side of the funnel array. For driving in the hard direction, there is a critical skyrmion density below which the skyrmions become trapped. Above this critical value, a clogging effect appears with multiple depinning and repinning states where the skyrmions can rearrange into different clogged configurations, while at higher drives, the velocity-force curves become continuous. When skyrmions pile up near the funnel opening, the effective size of the opening is reduced and the passage of other skyrmions is blocked by the repulsive skyrmion-skyrmion interactions. We observe a strong diode effect in which the critical depinning force is higher and the velocity response is smaller for hard direction driving. As the ratio of Magnus force to dissipative term is varied, the skyrmion velocity varies in a non-linear and non-monotonic way due to the pile up of skyrmions on one side of the funnels. At high Magnus forces, the clogging effect for hard direction driving is diminished. |
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Clogging, diode and collective effects of skyrmions in funnel geometriescloggingcollective effectsjammingskyrmionskyrmion dynamicsUsing a particle-based model, we examine the collective dynamics of skyrmions interacting with a funnel potential under dc driving as the skyrmion density and relative strength of the Magnus and damping terms are varied. For driving in the easy direction, we find that increasing the skyrmion density reduces the average skyrmion velocity due to jamming of skyrmions near the funnel opening, while the Magnus force causes skyrmions to accumulate on one side of the funnel array. For driving in the hard direction, there is a critical skyrmion density below which the skyrmions become trapped. Above this critical value, a clogging effect appears with multiple depinning and repinning states where the skyrmions can rearrange into different clogged configurations, while at higher drives, the velocity-force curves become continuous. When skyrmions pile up near the funnel opening, the effective size of the opening is reduced and the passage of other skyrmions is blocked by the repulsive skyrmion-skyrmion interactions. We observe a strong diode effect in which the critical depinning force is higher and the velocity response is smaller for hard direction driving. As the ratio of Magnus force to dissipative term is varied, the skyrmion velocity varies in a non-linear and non-monotonic way due to the pile up of skyrmions on one side of the funnels. At high Magnus forces, the clogging effect for hard direction driving is diminished.Departamento de Física Faculdade de Ciências Unesp-Universidade Estadual Paulista, CP 473 SPPOSMAT Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista—UNESP, SP, CP 473Department of Physics University of Antwerp, Groenenborgerlaan 171Theoretical Division Center for Nonlinear Studies Los Alamos National LaboratoryDepartamento de Física Faculdade de Ciências Unesp-Universidade Estadual Paulista, CP 473 SPPOSMAT Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista—UNESP, SP, CP 473Universidade Estadual Paulista (UNESP)University of AntwerpLos Alamos National LaboratoryBellizotti Souza, J. C. [UNESP]Vizarim, N. P. [UNESP]Reichhardt, C. J.O.Reichhardt, C.Venegas, P. A. [UNESP]2023-07-29T12:34:09Z2023-07-29T12:34:09Z2022-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1088/1367-2630/ac9749New Journal of Physics, v. 24, n. 10, 2022.1367-2630http://hdl.handle.net/11449/24619310.1088/1367-2630/ac97492-s2.0-85140892604Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNew Journal of Physicsinfo:eu-repo/semantics/openAccess2023-07-29T12:34:09Zoai:repositorio.unesp.br:11449/246193Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-07-29T12:34:09Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Clogging, diode and collective effects of skyrmions in funnel geometries |
title |
Clogging, diode and collective effects of skyrmions in funnel geometries |
spellingShingle |
Clogging, diode and collective effects of skyrmions in funnel geometries Bellizotti Souza, J. C. [UNESP] clogging collective effects jamming skyrmion skyrmion dynamics |
title_short |
Clogging, diode and collective effects of skyrmions in funnel geometries |
title_full |
Clogging, diode and collective effects of skyrmions in funnel geometries |
title_fullStr |
Clogging, diode and collective effects of skyrmions in funnel geometries |
title_full_unstemmed |
Clogging, diode and collective effects of skyrmions in funnel geometries |
title_sort |
Clogging, diode and collective effects of skyrmions in funnel geometries |
author |
Bellizotti Souza, J. C. [UNESP] |
author_facet |
Bellizotti Souza, J. C. [UNESP] Vizarim, N. P. [UNESP] Reichhardt, C. J.O. Reichhardt, C. Venegas, P. A. [UNESP] |
author_role |
author |
author2 |
Vizarim, N. P. [UNESP] Reichhardt, C. J.O. Reichhardt, C. Venegas, P. A. [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) University of Antwerp Los Alamos National Laboratory |
dc.contributor.author.fl_str_mv |
Bellizotti Souza, J. C. [UNESP] Vizarim, N. P. [UNESP] Reichhardt, C. J.O. Reichhardt, C. Venegas, P. A. [UNESP] |
dc.subject.por.fl_str_mv |
clogging collective effects jamming skyrmion skyrmion dynamics |
topic |
clogging collective effects jamming skyrmion skyrmion dynamics |
description |
Using a particle-based model, we examine the collective dynamics of skyrmions interacting with a funnel potential under dc driving as the skyrmion density and relative strength of the Magnus and damping terms are varied. For driving in the easy direction, we find that increasing the skyrmion density reduces the average skyrmion velocity due to jamming of skyrmions near the funnel opening, while the Magnus force causes skyrmions to accumulate on one side of the funnel array. For driving in the hard direction, there is a critical skyrmion density below which the skyrmions become trapped. Above this critical value, a clogging effect appears with multiple depinning and repinning states where the skyrmions can rearrange into different clogged configurations, while at higher drives, the velocity-force curves become continuous. When skyrmions pile up near the funnel opening, the effective size of the opening is reduced and the passage of other skyrmions is blocked by the repulsive skyrmion-skyrmion interactions. We observe a strong diode effect in which the critical depinning force is higher and the velocity response is smaller for hard direction driving. As the ratio of Magnus force to dissipative term is varied, the skyrmion velocity varies in a non-linear and non-monotonic way due to the pile up of skyrmions on one side of the funnels. At high Magnus forces, the clogging effect for hard direction driving is diminished. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-10-01 2023-07-29T12:34:09Z 2023-07-29T12:34:09Z |
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/ac9749 New Journal of Physics, v. 24, n. 10, 2022. 1367-2630 http://hdl.handle.net/11449/246193 10.1088/1367-2630/ac9749 2-s2.0-85140892604 |
url |
http://dx.doi.org/10.1088/1367-2630/ac9749 http://hdl.handle.net/11449/246193 |
identifier_str_mv |
New Journal of Physics, v. 24, n. 10, 2022. 1367-2630 10.1088/1367-2630/ac9749 2-s2.0-85140892604 |
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_ |
1799965470682513408 |