Parallel pumping of magnons in inhomogeneous spin textures probed through NV spin relaxometry

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

doi:10.1063/5.0192063

Parallel pumping of magnons in inhomogeneous spin textures probed through NV spin relaxometry

Journal Article · Wed Feb 21 00:00:00 EST 2024 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0192063· OSTI ID:2571402

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Case Western Reserve Univ., Cleveland, OH (United States)
Case Western Reserve Univ., Cleveland, OH (United States); Pennsylvania State Univ., University Park, PA (United States)
Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

We combine micromagnetic simulations and nitrogen-vacancy (NV) defect center spin relaxometry measurements to study magnon modes in inhomogeneous spin textures. A thin, micrometer-scale ferromagnetic disk is magnetized in a vortex state in which the magnetization curls around a central core. Micromagnetic simulations show that at zero applied field, the magnetization dynamics of the disk consist of a low frequency gyrotropic mode and higher frequency azimuthal magnon modes, all far detuned from the NV spin transition frequencies. An in-plane static magnetic field breaks the azimuthal symmetry of the vortex state, resulting in the magnon modes transforming in frequency and spatial profile as the field increases. Experimentally, we probe the dynamics of vortex magnetization as a function of applied in-plane static field and ac driving frequency by optically monitoring a nearby NV defect center spin. At certain values of the applied magnetic field, we observe enhanced spin relaxation when driving at twice the frequency of the NV ground state spin transition in optically detected magnetic resonance measurements. We attribute this effect to parallel pumping of a magnon mode in the disk producing magnons at half the excitation frequency. Micromagnetic simulations support this finding, showing spatial and spectral overlap of a confined magnon mode and an NV spin transition, with sufficient interaction strength to explain the observed signal.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2571402

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 135; ISSN 0021-8979; ISSN 1089-7550

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

Country of Publication:: United States

Language:: English

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