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

Xi-guang Wang, Guang-hua Guo and Jamal Berakdar ()
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Xi-guang Wang: School of Physics and Electronics, Central South University
Guang-hua Guo: School of Physics and Electronics, Central South University
Jamal Berakdar: Institut für Physik, Martin-Luther Universität Halle-Wittenberg

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-19431-3

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