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

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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Article number083903
JournalJournal of Applied Physics
Volume130
Issue number8
DOIs
StatePublished - Aug 28 2021
Externally publishedYes

Funding

We thank Jonathan Karsch and Sean Sullivan for careful reading of the manuscript and Kenichi Ohno for help with diamond growth. Diamond sample preparations at Argonne National Lab were primarily supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (F.J.H. and D.D.A.), with support from the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers. The work by S.S.-L.Z. was supported by College of Arts and Sciences, Case Western Reserve University.

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