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

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

doi:10.1088/1361-648x/ac0081

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

Journal Article · 09 June 2021 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/1361-648x/ac0081 · OSTI ID:1890980

^[1]; Bellizotti Souza, J. C. ^[1];

^[2];

^[2]; Venegas, P. A. ^[1]

São Paulo State University (UNESP) (Brazil)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this work, we numerically examine the dynamics of a single skyrmion driven over triangular and honeycomb obstacle arrays at zero temperature. The skyrmion Hall angle θ_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 θ_sk = –30° and –60°. 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 θ_sk = –30° and –60° phases as a function of the Magnus force, and discuss possibilities for switching between these phases using topological selection.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: São Paulo Research Foundation (FAPESP); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1890980

Report Number(s):: LA-UR-21-22422

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 30 Vol. 33; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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