Increasing of the Photon- Magnon Coupling Strength in a System of Coupled Microwave Resonators with a Magnetic Sample

For a system of double split-ring resonator with a magnetic film, a large value of photon-magnon coupling strength was achieved numerically at the frequency of the high-quality “trapped” mode. To analyze the quality factor of the resonator modes, a modified model of forced oscillations of two coupled oscillators was proposed, which is based on the model of two inductively coupled circuits. It was shown that for a certain phase shift in the coupling coefficient between the oscillators, there is a sharp increase in the amplitude and quality factor of forced oscillations. This theoretical conclusion is confirmed by numerical simulation of double split-ring resonator and magnetic sample.