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

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

doi:10.1103/physrevapplied.10.064031

Title: 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. ^[1]; Berezovsky, J. ^[1]

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.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008148; DESC008148

OSTI ID:: 1611018

Alternate ID(s):: OSTI ID: 1485733

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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