Spin dynamical phase and anti-resonance in a strongly coupled magnon-photon system

TL;DR

This paper experimentally investigates a strongly coupled magnon-photon system, revealing anti-resonance phenomena and phase evolution, providing a standard method for phase analysis applicable to various strongly coupled systems.

Contribution

It introduces a novel phase analysis technique for strongly coupled magnon-photon systems, applicable to other coupled systems, and demonstrates its effectiveness through experimental results.

Findings

Observation of anti-resonance indicating phase change

Technique for phase evolution analysis of magnon dark modes

Standard procedure for phase characterization in strongly coupled systems

Abstract

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.