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    Strong Coupling between Propagating Spin Waves and Microwave Photons in a Superconducting Resonator

    Yi Li1,*, Jinho Lim2,3, Xingzhi Wang2,3, Tomas Polakovic4, Carissa Kiehl1,5, Moojune Song1,6, Phuoc Cao Van7, Ralu Divan8, Ulrich Welp1 et al.

    Charudatta Phatak1, Jong-Ryul Jeong7, Kab-Jin Kim6, Jian-Min Zuo2,3,9, Axel Hoffmann2,3,†, and Valentine Novosad1,10,‡

    • *Contact author: yili@anl.gov
    • †Contact author: axelh@illinois.edu
    • ‡Contact author: novosad@anl.gov

    Phys. Rev. Lett. 137, 116706 – Published 10 September, 2026

    DOI: https://doi.org/10.1103/8t91-w9nn

    Abstract

    We demonstrate strong coupling between propagating spin-wave modes and microwave photons in superconducting resonator-magnetic thin film hybrid circuits. By fabricating the resonator directly on yttrium iron garnet thin films grown on rare-earth-free Y3Sc2Ga3O12 substrates, we achieve strong coupling of both Damon-Eshbach and backward-volume spin-wave modes to the resonator, with coupling strengths exceeding both the magnon and photon damping rates. Furthermore, we observe nonreciprocal spin-wave radiation of the hybrid magnonic mode in the Damon-Eshbach configuration, highlighting the potential for incorporating intrinsic spin-wave nonreciprocity into hybrid magnonic systems. These results open new avenues for integrating spin-wave magnonics with cavity magnonics and for harnessing spin waves for potential applications in quantum information science.

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