| 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: | JOURNAL OF PHYSICS-CONDENSED MATTER; v. 35, n. 1, p. 10-pg., 2023-01-11. |
| Resumo | |
Using a particle based model, we investigate the skyrmion dynamical behavior in a channel where the upper wall contains divots of one depth and the lower wall contains divots of a different depth. Under an applied driving force, skyrmions in the channels move with a finite skyrmion Hall angle that deflects them toward the upper wall for -x direction driving and the lower wall for +x direction driving. When the upper divots have zero height, the skyrmions are deflected against the flat upper wall for -x direction driving and the skyrmion velocity depends linearly on the drive. For +x direction driving, the skyrmions are pushed against the lower divots and become trapped, giving reduced velocities and a nonlinear velocity-force response. When there are shallow divots on the upper wall and deep divots on the lower wall, skyrmions get trapped for both driving directions; however, due to the divot depth difference, skyrmions move more easily under -x direction driving, and become strongly trapped for +x direction driving. The preferred -x direction motion produces what we call a Magnus diode effect since it vanishes in the limit of zero Magnus force, unlike the diode effects observed for asymmetric sawtooth potentials. We show that the transport curves can exhibit a series of jumps or dips, negative differential conductivity, and reentrant pinning due to collective trapping events. We also discuss how our results relate to recent continuum modeling on a similar skyrmion diode system. (AU) | |
| 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 |
| 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 |