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Title: Stochastic Dynamics of a Ferromagnetic Vortex Revealed by Single-Spin Magnetometry

Abstract

We study the dynamics of a magnetic vortex in a permalloy disk, as it is switched between bistable pinning sites in the presence of room-temperature thermal noise. We use static and time-resolved magneto-optical Kerr-effect microscopy to characterize the equilibrium and nonequilibrium motion of the vortex in response to a train of magnetic field pulses. The limitations of this approach due to inhomogeneous averaging are overcome by using a proximal nitrogen-vacancy spin in diamond to probe the final position of the vortex core following a single magnetic field pulse. Repeating this single-shot measurement, we characterize the probability of switching between two bistable pinning sites as a function of pulse time. Here, we develop a simple model of the stochastic vortex trajectory through the pinning sites’ basins of attraction to understand how the separate contributions of damping and dephasing result in the observed switching behavior.

Authors:
 [1];  [1];  [1]
+ Show Author Affiliations
  1. Case Western Reserve Univ., Cleveland, OH (United States)
Publication Date:
Research Org.:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1611018
Alternate Identifier(s):
OSTI ID: 1485733
Grant/Contract Number:  
SC0008148; DESC008148
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 10; Journal Issue: 6; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Magnetic vortices; Magnetization dynamics; Magnetization switching; Metrology; Skyrmions; Nitrogen vacancy centers in diamond; Magneto-optical Kerr effect; Optically detected magnetic resonance

Citation Formats

Badea, R., Haber, E., and Berezovsky, J. Stochastic Dynamics of a Ferromagnetic Vortex Revealed by Single-Spin Magnetometry. United States: N. p., 2018. Web. doi:10.1103/physrevapplied.10.064031.
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Badea, R., Haber, E., & Berezovsky, J. Stochastic Dynamics of a Ferromagnetic Vortex Revealed by Single-Spin Magnetometry. United States. https://doi.org/10.1103/physrevapplied.10.064031
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Badea, R., Haber, E., and Berezovsky, J. Thu . "Stochastic Dynamics of a Ferromagnetic Vortex Revealed by Single-Spin Magnetometry". United States. https://doi.org/10.1103/physrevapplied.10.064031. https://www.osti.gov/servlets/purl/1611018.
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@article{osti_1611018,
title = {Stochastic Dynamics of a Ferromagnetic Vortex Revealed by Single-Spin Magnetometry},
author = {Badea, R. and Haber, E. and Berezovsky, J.},
abstractNote = {We study the dynamics of a magnetic vortex in a permalloy disk, as it is switched between bistable pinning sites in the presence of room-temperature thermal noise. We use static and time-resolved magneto-optical Kerr-effect microscopy to characterize the equilibrium and nonequilibrium motion of the vortex in response to a train of magnetic field pulses. The limitations of this approach due to inhomogeneous averaging are overcome by using a proximal nitrogen-vacancy spin in diamond to probe the final position of the vortex core following a single magnetic field pulse. Repeating this single-shot measurement, we characterize the probability of switching between two bistable pinning sites as a function of pulse time. Here, we develop a simple model of the stochastic vortex trajectory through the pinning sites’ basins of attraction to understand how the separate contributions of damping and dephasing result in the observed switching behavior.},
doi = {10.1103/physrevapplied.10.064031},
journal = {Physical Review Applied},
number = 6,
volume = 10,
place = {United States},
year = {Thu Dec 13 00:00:00 EST 2018},
month = {Thu Dec 13 00:00:00 EST 2018}
}
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https://doi.org/10.1103/physrevapplied.10.064031
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