We experimentally studied a strongly coupled magnon-photon system via microwave transmission measurements. An anti-resonance, i.e. the suppression of the microwave transmission, is observed, indicating a relative phase change between the magnon response and the driving microwave field. We show that this anti-resonance feature can be used to interpret the phase evolution of the coupled magnon-microwave system and apply this technique to reveal the phase evolution of magnon dark modes. Our work provides a standard procedure for the phase analysis of strongly coupled systems, enabling the phase characterization of each subsystem, and can be generally applied to other strongly coupled systems.
@article{arxiv.1606.03056,
title = {Spin dynamical phase and anti-resonance in a strongly coupled magnon-photon system},
author = {Michael Harder and Paul Hyde and Lihui Bai and Christophe Match and Can-Ming Hu},
journal= {arXiv preprint arXiv:1606.03056},
year = {2016}
}