Multi-mode input-output model for cavity magnonics: phase-resolved control of level repulsion, level attraction, and nonreciprocal transmission

TL;DR

This paper experimentally validates a comprehensive input-output model for cavity magnonics that captures phase effects, enabling precise control of level interactions and nonreciprocal transmission in cavity-magnon systems.

Contribution

The study introduces a unified phase-inclusive model that accurately predicts and controls level phenomena and nonreciprocal transmission in cavity magnonics.

Findings

Model accurately reproduces experimental results across coupling regimes.

Explicit phase accounting explains transition from level repulsion to attraction.

Framework enables design of phase-controlled cavity-magnon devices.

Abstract

We experimentally validate a unified input--output model that incorporates internal and external coupling phases across multiple cavity modes in a room-temperature cavity magnonic system. By explicitly accounting for both phase contributions, the model provides a clear interpretation of the transition from level repulsion to level attraction at an interference-induced antiresonance, and accurately reproduces nonreciprocal transmission arising from the internal phases of the contributing modes. Quantitative agreement between experiments and simulations is obtained across all coupling regimes, establishing a predictive framework for phase-controlled cavity--magnon devices including isolators, circulators, and quantum transducers.