Transient response of the cavity magnon-polariton

Abstract

The Rabi oscillations of a coupled spin-photon system are experimentally studied using time-domain microwave transmission measurements. An external magnetic bias field is applied to control the amplitude and frequency of Rabi oscillations, which are a measure of the coherent spin-photon energy exchange and coupling strength, respectively. The amplitude and frequency control is described in the time domain as the transient response of a two-level spin-photon system. This approach reveals the link between steady-state and transient behavior of the cavity magnon-polariton, which is necessary to interpret time-domain cavity-spintronic experiments. This transient model also allows us to understand and quantify the polariton mode composition, which can be controlled by the bias field.