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Title: Noise fluctuations and drive dependence of the skyrmion Hall effect in disordered systems

Abstract

Using a particle-based simulation model, we show that quenched disorder creates a drive-dependent skyrmion Hall effect as measured by the change in the ratio $$R={V}_{\perp }/{V}_{| | }$$ of the skyrmion velocity perpendicular (V ⊥) and parallel ($${V}_{| | }$$) to an external drive. R is zero at depinning and increases linearly with increasing drive, in agreement with recent experimental observations. At sufficiently high drives where the skyrmions enter a free flow regime, R saturates to the disorder-free limit. In addition, this behavior is robust for a wide range of disorder strengths and intrinsic Hall angle values, and occurs whenever plastic flow is present. For systems with small intrinsic Hall angles, we find that the Hall angle increases linearly with external drive, as also observed in experiment. In the weak pinning regime where the skyrmion lattice depins elastically, R is nonlinear and the net direction of the skyrmion lattice motion can rotate as a function of external drive. We show that the changes in the skyrmion Hall effect correlate with changes in the power spectrum of the skyrmion velocity noise fluctuations. The plastic flow regime is associated with $1/f$ noise, while in the regime in which R has saturated, the noise is white with a weak narrow band signal, and the noise power drops by several orders of magnitude. Finally, at low drives, the velocity noise in the perpendicular and parallel directions is of the same order of magnitude, while at intermediate drives the perpendicular noise fluctuations are much larger.

Authors:
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1327449
Report Number(s):
LA-UR-16-23179
Journal ID: ISSN 1367-2630
Grant/Contract Number:
AC52-06NA25396; 20160369ER
Resource Type:
Journal Article: Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 9; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; skyrmions; Hall effect; velocity noise; dynamic phase transitions

Citation Formats

Reichhardt, Charles, and Olson Reichhardt, Cynthia Jane. Noise fluctuations and drive dependence of the skyrmion Hall effect in disordered systems. United States: N. p., 2016. Web. doi:10.1088/1367-2630/18/9/095005.
Reichhardt, Charles, & Olson Reichhardt, Cynthia Jane. Noise fluctuations and drive dependence of the skyrmion Hall effect in disordered systems. United States. doi:10.1088/1367-2630/18/9/095005.
Reichhardt, Charles, and Olson Reichhardt, Cynthia Jane. 2016. "Noise fluctuations and drive dependence of the skyrmion Hall effect in disordered systems". United States. doi:10.1088/1367-2630/18/9/095005.
@article{osti_1327449,
title = {Noise fluctuations and drive dependence of the skyrmion Hall effect in disordered systems},
author = {Reichhardt, Charles and Olson Reichhardt, Cynthia Jane},
abstractNote = {Using a particle-based simulation model, we show that quenched disorder creates a drive-dependent skyrmion Hall effect as measured by the change in the ratio $R={V}_{\perp }/{V}_{| | }$ of the skyrmion velocity perpendicular (V ⊥) and parallel (${V}_{| | }$) to an external drive. R is zero at depinning and increases linearly with increasing drive, in agreement with recent experimental observations. At sufficiently high drives where the skyrmions enter a free flow regime, R saturates to the disorder-free limit. In addition, this behavior is robust for a wide range of disorder strengths and intrinsic Hall angle values, and occurs whenever plastic flow is present. For systems with small intrinsic Hall angles, we find that the Hall angle increases linearly with external drive, as also observed in experiment. In the weak pinning regime where the skyrmion lattice depins elastically, R is nonlinear and the net direction of the skyrmion lattice motion can rotate as a function of external drive. We show that the changes in the skyrmion Hall effect correlate with changes in the power spectrum of the skyrmion velocity noise fluctuations. The plastic flow regime is associated with $1/f$ noise, while in the regime in which R has saturated, the noise is white with a weak narrow band signal, and the noise power drops by several orders of magnitude. Finally, at low drives, the velocity noise in the perpendicular and parallel directions is of the same order of magnitude, while at intermediate drives the perpendicular noise fluctuations are much larger.},
doi = {10.1088/1367-2630/18/9/095005},
journal = {New Journal of Physics},
number = 9,
volume = 18,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/1367-2630/18/9/095005

Citation Metrics:
Cited by: 4works
Citation information provided by
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