Nonlinear multi-magnon scattering in artificial spin ice
Date
2023-06-09
Journal Title
Journal ISSN
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Publisher
Nature Communications
Abstract
Magnons, the quantum-mechanical fundamental excitations of magnetic solids, are bosons whose number does not need to be conserved in scattering processes. Microwave-induced parametric magnon processes, often called Suhl instabilities, have been believed to occur in magnetic thin films only, where quasi-continuous magnon bands exist. Here, we reveal the existence of such nonlinear magnon-magnon scattering processes and their coherence in ensembles of magnetic nanostructures known as artificial spin ice. We find that these systems exhibit effective scattering processes akin to those observed in continuous magnetic thin films. We utilize a combined microwave and microfocused Brillouin light scattering measurement approach to investigate the evolution of their modes. Scattering events occur between resonance frequencies that are determined by each nanomagnet’s mode volume and profile. Comparison with numerical simulations reveals that frequency doubling is enabled by exciting a subset of nanomagnets that, in turn, act as nanosized antennas, an effect that is akin to scattering in continuous films. Moreover, our results suggest that tunable directional scattering is possible in these structures.
Description
This article was originally published in Nature Communications. The version of record is available at: https://doi.org/10.1038/s41467-023-38992-7.
© The Author(s) 2023.
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This research was featured in UDaily on 10/19/2024 at: https://www.udel.edu/udaily/2024/october/neural-network-artificial-intelligence-neuromorphic-computing-benjamin-jungfleisch/
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Citation
Lendinez, S., Kaffash, M.T., Heinonen, O.G. et al. Nonlinear multi-magnon scattering in artificial spin ice. Nat Commun 14, 3419 (2023). https://doi.org/10.1038/s41467-023-38992-7