  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.
