| Texto completo | |
| Autor(es): |
Souza, J. C. Bellizotti
;
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. 26, n. 11, p. 12-pg., 2024-11-01. |
| Resumo | |
Using atomistic simulations, we investigate the dynamical behavior of magnetic skyrmions in dimer and trimer molecular crystal arrangements, as well as bipartite lattices at 3/2 and 5/2 fillings, under ac driving over a square array of anisotropy defects. For low ac amplitudes, at all fillings reversible motion appears in which the skyrmions return to their original positions at the end of each ac drive cycle and the diffusion is zero. We also identify two distinct irreversible regimes. The first is a translating regime in which the skyrmions form channels of flow in opposing directions and translate by one substrate lattice constant per ac drive cycle. The translating state appears in the dimer and trimer arrangements, and produces pronounced peaks in the diffusivity in the direction perpendicular to the external drive. For larger ac amplitudes, we find chaotic irreversible motion in which the skyrmions can randomly exchange places with each other over time, producing long-time diffusive behavior both parallel and perpendicular to the ac driving direction. (AU) | |
| Processo FAPESP: | 23/17545-1 - Comportamento Dinâmico de Skyrmions em Materiais Magnéticos Interagindo com Defeitos Anisotrópicos |
| Beneficiário: | José Carlos Bellizotti Souza |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Mestrado |
| Processo FAPESP: | 21/04655-8 - Aprendizagem de máquina e suas aplicações na física quântica: metrologia, termologia, transições de fase e desacoplamento dinâmico |
| Beneficiário: | Felipe Fernandes Fanchini |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |