Observation of Purcell Effect in Electrically Coupled Cavity-Magnet System

Abstract

We report the observation of the Purcell effect in a cavity-metallic magnet hybrid system using electric-field-mediated coupling. In this configuration, microwave-induced axial currents in the microwire induce circular magnetic fields that drive the ferromagnetic resonance (FMR) of the magnetized microwire. Field-dependent transmission and reflection spectroscopies reveal a clear cavity perturbation consistent with the Purcell regime, in which the magnetic loss rate exceeds the light-matter coupling strength. Despite the small magnetic volume ($\sim 10^{-13}{\text{m}}^3$), measurements performed at both room temperature and $T=7$ mK show coupling rates as high as $g/2pi=56$ MHz, one order of magnitude stronger than the one expected from conventional coupling at the magnetic antinode. Time-domain ringdown measurements directly show the magnetic-field-dependent modification of the cavity photon lifetime, in agreement with theoretical predictions. These results establish a versatile approach for coupling microwave fields to metallic magnets via geometric and electric-field-mediated interactions, opening new opportunities for hybrid cavity-magnet systems.

References in corpus (31)

• Strongly coupled magnons and cavity microwave photons
• Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
• High cooperativity in coupled microwave resonator ferrimagnetic insulator hybrids
• Quantum information processing with superconducting circuits: a review
• Hybrid quantum systems based on magnonics
• Quantum magnonics: when magnon spintronics meets quantum information science
• High Cooperativity Cavity QED with Magnons at Microwave Frequencies
• Generating Single Microwave Photons in a Circuit
• Cavity Magnonics
• Bidirectional conversion between microwave and light via ferromagnetic magnons
• Magnon dark modes and gradient memory
• Resolving magnon number states in quantum magnonics
• Strong Coupling between Microwave Photons and Nanomagnet Magnons
• Strong magnon-photon coupling in ferromagnet-superconducting resonator thin-film devices
• Coupled Spin-Light dynamics in Cavity Optomagnonics
• Dissipation-based Quantum Sensing of Magnons with a Superconducting Qubit
• Cavity mediated manipulation of distant spin currents using cavity-magnon-polariton
• Optomagnonics in Magnetic Solids
• Purcell Effect in the Stimulated and Spontaneous Emission Rates of Nanoscale Semiconductor Lasers
• Electron spin ensemble strongly coupled to a three-dimensional microwave cavity
• Topological Properties of a Coupled Spin-Photon System Induced by Damping
• Purcell effect with microwave drive: Suppression of qubit relaxation rate
• Study of the cavity-magnon-polariton transmission line shape
• Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system
• Cavity Magnon Polaritons with Lithium Ferrite and 3D Microwave Resonators at milli-Kelvin Temperatures
• Mode Structure in Superconducting Metamaterial Transmission Line Resonators
• Magnon-photon coupling in a non-collinear magnetic insulator Cu${}_2$OSeO${}_3$
• Coupling a Superconducting Qubit to a Left-Handed Metamaterial Resonator
• Cavity-mediated superconductor$\unicode{x2013}$ferromagnetic insulator coupling
• Testing Time Reversal Symmetry in Artificial Atoms
• Theory of Magnon Purcell Effect in Cavity Magnonic System