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Strong magnon-photon coupling in ferromagnet-superconducting resonator thin-film devices

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arxiv 1902.09715 v1 pith:VIDJZ3CG submitted 2019-02-26 cond-mat.mes-hall

Strong magnon-photon coupling in ferromagnet-superconducting resonator thin-film devices

Yi Li , Tomas Polakovic , Yong-Lei Wang , Jing Xu , Sergi Lendinez , Zhizhi Zhang , Junjia Ding , Trupti Khaire
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Hilal Saglam Ralu Divan John Pearson Wai-Kwong Kwok Zhili Xiao Valentine Novosad Axel Hoffmann Wei Zhang
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keywords couplingmagnon-photonpermalloyresonatordemonstratestrengthstrongsuperconducting
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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 mediated by 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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