Directional locking and the influence of obstacle density on skyrmion dynamics in triangular and honeycomb arrays

Autor(es)

Vizarim, N. P. ^[1] ; Bellizotti Souza, J. C. ^[2] ; Reichhardt, C. ^{[3, 4]} ; Reichhardt, C. J. O. ^{[3, 4]} ; Venegas, P. A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Fac Ciencias, POSMAT Programa Posgrad Ciencia & Tecnol Mat, CP 473, BR-17033360 Bauru, SP - Brazil

^[2] Univ Estadual Paulista UNESP, Fac Ciencias, Dept Fis, CP 473, BR-17033360 Bauru, SP - Brazil

^[3] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 - USA

^[4] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 33, n. 30 JUL 28 2021.
• Citações Web of Science: 0

Resumo

We numerically examine the dynamics of a single skyrmion driven over triangular and honeycomb obstacle arrays at zero temperature. The skyrmion Hall angle theta (sk), defined as the angle between the applied external drive and the direction of the skyrmion motion, increases in quantized steps or continuously as a function of the applied drive. For the obstacle arrays studied in this work, the skyrmion exhibits two main directional locking angles of theta (sk) = -30 degrees and -60 degrees. We show that these directions are privileged due to the obstacle landscape symmetry, and coincide with channels along which the skyrmion may move with few or no obstacle collisions. Here we investigate how changes in the obstacle density can modify the skyrmion Hall angles and cause some dynamic phases to appear or grow while other phases vanish. This interesting behavior can be used to guide skyrmions along designated trajectories via regions with different obstacle densities. For fixed obstacle densities, we investigate the evolution of the locked theta (sk) = -30 degrees and -60 degrees phases as a function of the Magnus force, and discuss possibilities for switching between these phases using topological selection. (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