| Texto completo | |
| Autor(es): |
Bellizotti Souza, J. C.
;
Vizarim, N. P.
;
Reichhardt, C. J. O.
;
Reichhardt, C.
;
Venegas, P. A.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NEW JOURNAL OF PHYSICS; v. 24, n. 10, p. 14-pg., 2022-10-01. |
| 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. (AU) | |
| Processo FAPESP: | 21/04941-0 - Comportamento dinâmicos de Skyrmions em filmes Quirais Infinitos na presença de potenciais de aprisionamento periódicos a temperatura nula |
| Beneficiário: | José Carlos Bellizotti Souza |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 17/20976-3 - Comportamento dinâmico de skyrmions sob influência de arranjos periódicos de centros de aprisionamento em filmes finos infinitos de materiais magnéticos quirais |
| Beneficiário: | Nicolas Porto Vizarim |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |