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