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Title: Fluctuations and noise signatures of driven magnetic skyrmions

Abstract

Magnetic skyrmions are particlelike objects with topologically protected stability which can be set into motion with an applied current. Using a particle-based model we simulate current-driven magnetic skyrmions interacting with random quenched disorder and examine the skyrmion velocity fluctuations parallel and perpendicular to the direction of motion as a function of increasing drive. We show that the Magnus force contribution to skyrmion dynamics combined with the random pinning produces an isotropic effective shaking temperature. As a result, the skyrmions form a moving crystal at large drives instead of the moving smectic state observed in systems with a negligible Magnus force where the effective shaking temperature is anisotropic. Here, we demonstrate that spectral analysis of the velocity noise fluctuations can be used to identify dynamical phase transitions and to extract information about the different dynamic phases, and show how the velocity noise fluctuations are correlated with changes in the skyrmion Hall angle, transport features, and skyrmion lattice structure.

Authors:
 [1];  [2];  [3];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, La Jolla, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, San Diego, La Jolla, 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:
1514984
Alternate Identifier(s):
OSTI ID: 1373808
Report Number(s):
LA-UR-18-30674
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 8; 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; Material Science

Citation Formats

Díaz, Sebastián A., Reichhardt, C. J. O., Arovas, Daniel P., Saxena, Avadh, and Reichhardt, C. Fluctuations and noise signatures of driven magnetic skyrmions. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.085106.
Díaz, Sebastián A., Reichhardt, C. J. O., Arovas, Daniel P., Saxena, Avadh, & Reichhardt, C. Fluctuations and noise signatures of driven magnetic skyrmions. United States. doi:10.1103/PhysRevB.96.085106.
Díaz, Sebastián A., Reichhardt, C. J. O., Arovas, Daniel P., Saxena, Avadh, and Reichhardt, C. Wed . "Fluctuations and noise signatures of driven magnetic skyrmions". United States. doi:10.1103/PhysRevB.96.085106. https://www.osti.gov/servlets/purl/1514984.
@article{osti_1514984,
title = {Fluctuations and noise signatures of driven magnetic skyrmions},
author = {Díaz, Sebastián A. and Reichhardt, C. J. O. and Arovas, Daniel P. and Saxena, Avadh and Reichhardt, C.},
abstractNote = {Magnetic skyrmions are particlelike objects with topologically protected stability which can be set into motion with an applied current. Using a particle-based model we simulate current-driven magnetic skyrmions interacting with random quenched disorder and examine the skyrmion velocity fluctuations parallel and perpendicular to the direction of motion as a function of increasing drive. We show that the Magnus force contribution to skyrmion dynamics combined with the random pinning produces an isotropic effective shaking temperature. As a result, the skyrmions form a moving crystal at large drives instead of the moving smectic state observed in systems with a negligible Magnus force where the effective shaking temperature is anisotropic. Here, we demonstrate that spectral analysis of the velocity noise fluctuations can be used to identify dynamical phase transitions and to extract information about the different dynamic phases, and show how the velocity noise fluctuations are correlated with changes in the skyrmion Hall angle, transport features, and skyrmion lattice structure.},
doi = {10.1103/PhysRevB.96.085106},
journal = {Physical Review B},
number = 8,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}

Journal Article:
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Cited by: 8 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Real-space snapshot of the simulated system. Open black circles indicate pinning sites and filled blue dots indicate the instantaneous skyrmion positions. (b) Diagram illustrating the relationship between the driving force $F$$D$$\hat{x}$ applied along the $x$ direction and the instantaneous skyrmion velocity V averaged over all skyrmions. Themore » skyrmion Hall angle $θ$$Sk$ varies with $F$$D$, and the time-averaged skyrmion velocity $\langle$V$\rangle$ is aligned with $θ$$Sk$. The direction of V fluctuates around $θ$$Sk$ and we resolve V into its components $V$|| and $V$ that are parallel and perpendicular, respectively, to the direction defined by $θ$$Sk$.« less

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