  We report on the electrical detection of a hybrid magnon-photon system, which
is comprised of a magnetic sample coupled to a planar cavity. While the uniform
Kittel mode has the largest coupling strength among all the magnon modes, it
only generates a modest voltage signal by means of inverse spin-Hall effect. We
have found that the generated voltage can be significantly enhanced by
introducing a higher order magnon mode, which possesses a much higher spin
pumping efficiency and furthermore, it is nearly degenerated with the Kittel
mode. The experimental results can be explained by our theoretical model, and
suggest that the use of an auxiliary magnon mode can realize the configuration
of a magnon-photon system with both strong coupling and large spin current.
