Vortex microwave response in high kinetic inductance superconducting thin films
Superconducting thin films with high kinetic inductance are important for a variety of detector and microwave amplifier technologies, as well as the development of topologically protected qubits. Trapped magnetic flux vortices can be a significant loss mechanism in these various applications when located in regions where microwave currents are flowing. In addition, measurements of the vortex response can provide information about the underlying superconductor. We have performed field-cooled experiments at millikelvin temperatures with vortices trapped in microwave resonators patterned from various high kinetic inductance thin films, including TiN, NbTiN, and granular Al.