Control of magnon-photon coupling strength in a planar resonator/YIG thin film configuration

Abstract

A systematic study of the coupling at room temperature between the ferromagnetic resonance (FMR) and a planar resonator is presented. The chosen magnetic material is a ferrimagnetic insulator (Yttrrium Iron Garnet: YIG) which is positioned on top of a stop band (notch) filter based on a stub line capacitively coupled to 50 \(\Omega\) microstrip line resonating at 4.731 GHz. Control of the magnon-photon coupling strength is discussed as function of the microwave excitation configuration and the YIG thickness from 0.2 to 41 \(\mu\)m. From the latter dependence, we extract a single spin-photon coupling of g\(_{0}\)/2\(\pi\)=162\(\pm\)6 mHz and a maximum of an effective coupling of 290 MHz.