Fluctuations and noise signatures of driven magnetic skyrmions

Díaz, Sebastián A.; Reichhardt, C. J. O.; Arovas, Daniel P.; Saxena, Avadh; Reichhardt, C.

doi:10.1103/PhysRevB.96.085106

Title: Fluctuations and noise signatures of driven magnetic skyrmions

Journal Article · 02 August 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.96.085106 · OSTI ID:1514984

Díaz, Sebastián A. ^[1]; Reichhardt, C. J. O. ^[2]; Arovas, Daniel P. ^[3]; Saxena, Avadh ^[2]; Reichhardt, C. ^[2]

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

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.

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

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

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

OSTI ID:: 1514984

Alternate ID(s):: OSTI ID: 1373808

Report Number(s):: LA-UR-18-30674; PRBMDO

Journal Information:: Physical Review B, Vol. 96, Issue 8; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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