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Title: Avalanches and Criticality in Driven Magnetic Skyrmions

Abstract

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.

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, CA (United States); Univ. of Basel (Switzerland)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1524385
Alternate Identifier(s):
OSTI ID: 1426333
Report Number(s):
LA-UR-17-31034
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 11; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Díaz, Sebastian A., Reichhardt, Charles, Arovas, Daniel P., Saxena, Avadh Behari, and Reichhardt, Cynthia Jane O. Avalanches and Criticality in Driven Magnetic Skyrmions. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.117203.
Díaz, Sebastian A., Reichhardt, Charles, Arovas, Daniel P., Saxena, Avadh Behari, & Reichhardt, Cynthia Jane O. Avalanches and Criticality in Driven Magnetic Skyrmions. United States. doi:10.1103/PhysRevLett.120.117203.
Díaz, Sebastian A., Reichhardt, Charles, Arovas, Daniel P., Saxena, Avadh Behari, and Reichhardt, Cynthia Jane O. Thu . "Avalanches and Criticality in Driven Magnetic Skyrmions". United States. doi:10.1103/PhysRevLett.120.117203. https://www.osti.gov/servlets/purl/1524385.
@article{osti_1524385,
title = {Avalanches and Criticality in Driven Magnetic Skyrmions},
author = {Díaz, Sebastian A. and Reichhardt, Charles and Arovas, Daniel P. and Saxena, Avadh Behari and Reichhardt, Cynthia Jane O.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.120.117203},
journal = {Physical Review Letters},
number = 11,
volume = 120,
place = {United States},
year = {2018},
month = {3}
}

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