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Steering magnonic dynamics and permeability at exceptional points in a parity–time symmetric waveguide

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  • Xi-guang Wang

    (School of Physics and Electronics, Central South University
    Institut für Physik, Martin-Luther Universität Halle-Wittenberg)

  • Guang-hua Guo

    (School of Physics and Electronics, Central South University)

  • Jamal Berakdar

    (Institut für Physik, Martin-Luther Universität Halle-Wittenberg)

Abstract

Tuning the magneto optical response and magnetic dynamics are key elements in designing magnetic metamaterials and devices. This theoretical study uncovers a highly effective way of controlling the magnetic permeability via shaping the magnonic properties of coupled magnetic waveguides separated by a nonmagnetic spacer with strong spin–orbit interaction (SOI). We demonstrate how a spacer charge current leads to enhancement of magnetic damping in one waveguide and a decrease in the other, constituting a bias-controlled magnetic parity–time (PT) symmetric system at the verge of the exceptional point where magnetic gains/losses are balanced. We find phenomena inherent to PT-symmetric systems and SOI-driven interfacial structures, including field-controlled magnon power oscillations, nonreciprocal propagation, magnon trapping and enhancement as well as an increased sensitivity to perturbations and abrupt spin reversal. The results point to a new route for designing magnonic waveguides and microstructures with enhanced magnetic response.

Suggested Citation

  • Xi-guang Wang & Guang-hua Guo & Jamal Berakdar, 2020. "Steering magnonic dynamics and permeability at exceptional points in a parity–time symmetric waveguide," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19431-3
    DOI: 10.1038/s41467-020-19431-3
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    Cited by:

    1. Steffen Wittrock & Salvatore Perna & Romain Lebrun & Katia Ho & Roberta Dutra & Ricardo Ferreira & Paolo Bortolotti & Claudio Serpico & Vincent Cros, 2024. "Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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