Autor(es)

Souza, J. C. Bellizotti ; Vizarim, N. P. ; Reichhardt, C. J. O. ; Reichhardt, C. ; Venegas, P. A.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 37, n. 16, p. 16-pg., 2025-04-21.

Resumo

We compare the driven dynamics of skyrmions, antiskyrmions, and skyrmionium interacting with random disorder, circular defects, and asymmetric potentials. When interacting with a line defect at a constant drive, skyrmions and antiskyrmions show an acceleration effect for motion along the wall and a drop in velocity when they can cross the barrier. In contrast, skyrmionium travels at a reduced velocity when moving along a wall, and exhibits an increase in velocity once it can cross the barrier. For point defects, skyrmionium can be pinned for a finite fixed period of time, while for skyrmions and antiskyrmions, the Magnus force creates a deflection from the defect and an acceleration effect. For a given drive, skyrmionium moves twice as fast as skyrmions; however, skyrmionium is more susceptible to pinning effects than skyrmions and antiskyrmions. Additionally, there is a critical threshold where the skyrmionium transforms to a skyrmion that is associated with a drop in the velocity of the texture. We show that all three textures exhibit diode and ratchet effects when interacting with an asymmetric substrate, but skyrmions and antiskyrmions show a stronger ratcheting effect than skyrmionium due to the Magnus force. (AU)

• Processo FAPESP: 24/13248-5 - Comportamento de texturas topológicas magnéticas interagindo com interfaces visando controle e estabilidade para aplicações em spintrônica
• Beneficiário: Nicolas Porto Vizarim
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• 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: 24/02941-1 - Controle de texturas magnéticas interagindo com defeitos visando aplicações em spintrônica
• Beneficiário: Pablo Antonio Venegas Urenda
• Modalidade de apoio: Auxílio à Pesquisa - Regular