Relaxation of a single defect spin by the low-frequency gyrotropic mode of a magnetic vortex

Trimble, J.; Gould, B.; Heremans, F. J.; Zhang, S. S.-L.; Awschalom, D. D.; Berezovsky, J.

doi:10.1063/5.0055595

Relaxation of a single defect spin by the low-frequency gyrotropic mode of a magnetic vortex

Journal Article · Sat Aug 28 00:00:00 EDT 2021 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0055595· OSTI ID:1819545

Trimble, J. ^[1]; ^[1]; Heremans, F. J. ^[2]; Zhang, S. S.-L. ^[1]; ^[2]; ^[1]

Case Western Reserve Univ., Cleveland, OH (United States)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

We excite the gyrotropic mode of a magnetic vortex and observe the resulting effect on the spin state of a nearby nitrogen-vacancy (NV) defect in diamond. Thin permalloy disks fabricated on a diamond sample are magnetized in a vortex state in which the magnetization curls around a central core. The magnetization dynamics of this configuration are described by a discrete spectrum of confined magnon modes as well as a low-frequency gyrotropic mode in which the vortex core precesses about its equilibrium position. Despite the spin transition frequencies being far-detuned from the modes of the ferromagnet, we observe enhanced relaxation of the NV spin when driving the gyrotropic mode. Moreover, we map the spatial dependence of the interaction between the vortex and the spin by translating the vortex core within the disk with an applied magnetic field, resulting in steplike motion as the vortex is pinned and de-pinned. Strong spin relaxation is observed when the vortex core is within approximately 250 nm of the NV center defect. We attribute this effect to the higher frequencies in the spectrum of the magnetic fringe field arising from the soliton-like nature of the gyrotropic mode when driven with sufficiently large amplitude.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Case Western Reserve University; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1819545

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 130; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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