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  • Title: Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconductor Thin-Film Devices.
    Author: Li Y, Polakovic T, Wang YL, Xu J, Lendinez S, Zhang Z, Ding J, Khaire T, Saglam H, Divan R, Pearson J, Kwok WK, Xiao Z, Novosad V, Hoffmann A, Zhang W.
    Journal: Phys Rev Lett; 2019 Sep 06; 123(10):107701. PubMed ID: 31573284.
    Abstract:
    We demonstrate strong magnon-photon coupling of a thin-film Permalloy device fabricated on a coplanar superconducting resonator. A coupling strength of 0.152 GHz and a cooperativity of 68 are found for a 30-nm-thick Permalloy stripe. The coupling strength is tunable by rotating the biasing magnetic field or changing the volume of Permalloy. We also observe an enhancement of magnon-photon coupling in the nonlinear regime of the superconducting resonator, which is attributed to the nucleation of dynamic flux vortices. Our results demonstrate a critical step towards future integrated hybrid systems for quantum magnonics and on-chip coherent information transfer.
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