Avalanches and Criticality in Driven Magnetic Skyrmions

Díaz, Sebastian A.; Reichhardt, Charles; Arovas, Daniel P.; Saxena, Avadh Behari; Reichhardt, Cynthia Jane O.

doi:10.1103/PhysRevLett.120.117203

Title: Avalanches and Criticality in Driven Magnetic Skyrmions

Journal Article · Thu Mar 15 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.117203· OSTI ID:1524385

Díaz, Sebastian A. ^[1];

^[2]; Arovas, Daniel P. ^[3];

^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, CA (United States); Univ. of Basel (Switzerland)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, San Diego, CA (United States)

We demonstrate using numerical simulations that slowly driven Skyrmions interacting with random pinning move via correlated jumps or avalanches. The avalanches display power-law distributions in their duration and size, and the average avalanche shape for different avalanche durations can be scaled to a universal function, in agreement with theoretical predictions for systems in a nonequilibrium critical state. A distinctive feature of Skyrmions is the influence of the nondissipative Magnus term. When we increase the ratio of the Magnus term to the damping term, a change in the universality class of the behavior occurs, the average avalanche shape becomes increasingly asymmetric, and individual avalanches exhibit motion in the direction perpendicular to their own density gradient.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1524385

Alternate ID(s):: OSTI ID: 1426333

Report Number(s):: LA-UR-17-31034; PRLTAO

Journal Information:: Physical Review Letters, Vol. 120, Issue 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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