Unlocking Photon Magnon Interplay via Saturation Magnetization

TL;DR

This paper demonstrates that varying the saturation magnetization of YIG films allows precise control of photon magnon coupling strength in hybrid systems, advancing tunable quantum device design.

Contribution

It introduces a systematic method to control photon magnon coupling via saturation magnetization, supported by simulations and an analytical model.

Findings

Tuning Ms from 1750 Oe to 900 Oe adjusts coupling from 127 to 51 MHz.

A semiclassical model accurately predicts coupling behavior based on spin density.

Variable magnon damping effects extend frequency control capabilities.

Abstract

Photon magnon hybrid systems present a promising platform for the development of next generation devices in quantum information processing and quantum sensing technologies. In this study, we investigate the control of photon magnon coupling (PMC) strength through systematic variation of the saturation magnetization in a planar hexagonal ring resonator (HRR) integrated with a yttrium iron garnet (YIG) thin film configuration. Using full wave numerical simulations in CST Microwave Studio, we demonstrate that tuning the Ms of the YIG film from 1750 Oe to 900 Oe enables systematic control over the coupling strength across the 127 to 51 MHz range at room temperature. To explain the observed PMC dynamics, we develop a semiclassical analytical model based on electromagnetic theory that accurately reproduces the observed coupling behavior, revealing the key role of spin density in mediating the light matter interaction. The model is further extended to include the effects of variable magnon damping across different Ms values, enabling broader frequency control. These findings establish Ms as a key tuning parameter for tailoring PMC, with direct implications for the design of tunable hybrid systems for reconfigurable quantum devices.