Skyrmion transport and annihilation in funnel geometries

Autor(es)

Rocha, F. S. ; 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. 36, n. 11, p. 12-pg., 2024-03-20.

Resumo

Using atomistic simulations, we have investigated the transport and annihilation of skyrmions interacting with a funnel array under a current applied perpendicular to the funnel axis. We find that transport without annihilation is possible at low currents, when the motion is dominated by skyrmion-skyrmion interactions and skyrmions push each other through the funnel opening. Skyrmion annihilation occurs for higher currents when skyrmions in the upper half of the sample exert pressure on skyrmions in the bottom half of the sample due to the external current. Upon interacting with the funnel wall, the skyrmions undergo a size reduction that makes it easier for them to pass through the funnel opening. We find five phases as a function of the applied current and the size of the funnel opening: (i) pinned, (ii) transport without annihilation, (iii) transport with annihilation, (iv) complete annihilation, and (v) a reentrant pinning phase that only occurs for very narrow openings. Our findings provide insight into how to control skyrmion transport using funnel arrays by delineating regimes in which transport of skyrmions is possible as well as the conditions under which annihilation occurs. (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: 22/14053-8 - Estudo do Comportamento de Skrymions em Materiais Magnéticos na Presença de Defeitos
• Beneficiário: José Carlos Bellizotti Souza
• Modalidade de apoio: Bolsas no Brasil - 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