Busca avançada
Ano de início
Entree


Magnus induced diode effect for skyrmions in channels with periodic potentials

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