Control of magnon–photon coupling by a direct current in a Py/Pt-superconducting cavity hybrid system

Abstract

In this work, using a Permalloy film and a superconducting cavity, we highlight the unique dispersion in the microwave transmission properties of the magnon–photon coupled system in the Purcell regime, in which the modulation of the coupled system can be achieved by varying the magnon dissipation rate. It is demonstrated that decreasing the magnon dissipation rate can lead to an enhancement in magnon–photon coupling. By applying a direct current into the Permalloy/platinum bilayer, we achieve modulation of the coupling in the Purcell regime. The magnon–photon coupling is enhanced with the increasing current, which is related to the decrease in the magnon dissipation rate due to the thermal effect of the current. In addition, we establish an approach to obtain the coupling strength from the coupled microwave photon dispersion and linewidth. The electrical control of the Permalloy-superconducting cavity coupled system will play an important role in manipulating integrated hybrid magnon–photon devices.