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Title: Skyrmion relaxation dynamics in the presence of quenched disorder

Abstract

Using Langevin molecular dynamics simulations we study relaxation processes of interacting skyrmion systems with and without quenched disorder. Here, using the typical diffusion length as the time-dependent length characterizing the relaxation process, we find that clean systems always display dynamical scaling, and this even in cases where the typical length is not a simple power law of time. In the presence of the Magnus force, two different regimes are identified as a function of the noise strength. The Magnus force has also a major impact when attractive pinning sites are present, as this velocity-dependent force helps skyrmions to bend around defects and avoid caging effects. With the exception of the limit of large noise, for which dynamical scaling persists even in the presence of quenched disorder, attractive pinning sites capture a substantial fraction of skyrmions which results in a complex behavior of the two-time autocorrelation function that is not reproduced by a simple aging scaling ansatz.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Publication Date:
Research Org.:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1542268
Alternate Identifier(s):
OSTI ID: 1546467
Grant/Contract Number:  
SC0002308
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Magnetism, topological defects, skyrmions, non-equilibrium relaxation, aging, dynamic scaling

Citation Formats

Brown, Barton L., Tauber, Uwe Claus, and Pleimling, Michel. Skyrmion relaxation dynamics in the presence of quenched disorder. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.024410.
Brown, Barton L., Tauber, Uwe Claus, & Pleimling, Michel. Skyrmion relaxation dynamics in the presence of quenched disorder. United States. doi:10.1103/PhysRevB.100.024410.
Brown, Barton L., Tauber, Uwe Claus, and Pleimling, Michel. Tue . "Skyrmion relaxation dynamics in the presence of quenched disorder". United States. doi:10.1103/PhysRevB.100.024410.
@article{osti_1542268,
title = {Skyrmion relaxation dynamics in the presence of quenched disorder},
author = {Brown, Barton L. and Tauber, Uwe Claus and Pleimling, Michel},
abstractNote = {Using Langevin molecular dynamics simulations we study relaxation processes of interacting skyrmion systems with and without quenched disorder. Here, using the typical diffusion length as the time-dependent length characterizing the relaxation process, we find that clean systems always display dynamical scaling, and this even in cases where the typical length is not a simple power law of time. In the presence of the Magnus force, two different regimes are identified as a function of the noise strength. The Magnus force has also a major impact when attractive pinning sites are present, as this velocity-dependent force helps skyrmions to bend around defects and avoid caging effects. With the exception of the limit of large noise, for which dynamical scaling persists even in the presence of quenched disorder, attractive pinning sites capture a substantial fraction of skyrmions which results in a complex behavior of the two-time autocorrelation function that is not reproduced by a simple aging scaling ansatz.},
doi = {10.1103/PhysRevB.100.024410},
journal = {Physical Review B},
number = 2,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

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