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arXiv · 1902.09715

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·Hilal Saglam·Ralu Divan·John Pearson·Wai-Kwong Kwok·Zhili Xiao·Valentine Novosad·Axel Hoffmann·Wei Zhang
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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 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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Yi Li, Tomas Polakovic, Yong-Lei Wang, Jing Xu, Sergi Lendinez, Zhizhi Zhang, Junjia Ding, Trupti Khaire, Hilal Saglam, Ralu Divan, John Pearson, Wai-Kwong Kwok, Zhili Xiao, Valentine Novosad, Axel Hoffmann, Wei Zhang. 2019-02-26. Strong magnon-photon coupling in ferromagnet-superconducting resonator thin-film devices. https://doi.org/10.1103/physrevlett.123.107701

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