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

Badea, R.; Haber, E.; Berezovsky, J.

doi:10.1103/physrevapplied.10.064031

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

Journal Article · Thu Dec 13 00:00:00 EST 2018 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.10.064031· OSTI ID:1611018

Badea, R. ^[1]; Haber, E. ^[2]; Berezovsky, J. ^[2]

Case Western Reserve Univ., Cleveland, OH (United States); DOE/OSTI
Case Western Reserve Univ., Cleveland, OH (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Case Western Reserve Univ., Cleveland, OH (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0008148

OSTI ID:: 1611018

Alternate ID(s):: OSTI ID: 1485733

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 10; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Magnetic vortices
Magnetization dynamics
Magnetization switching
Magneto-optical Kerr effect
Metrology
Nitrogen vacancy centers in diamond
Optically detected magnetic resonance
Physics
Skyrmions

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

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