Kinetic Inductance Magnetometer

Abstract

Ultrasensitive magnetic field detection is utilized in the fields of science, medicine and industry. We report on a novel magnetometer relying on the kinetic inductance of superconducting material. The kinetic inductance exhibits a non-linear response with respect to DC current, a fact that is exploited by applying magnetic flux through a superconducting loop to generate a shielding current and a change in the inductance of the loop. The magnetometer is arranged into a resonator, allowing readout through a transmission measurement that makes the device compatible with radio frequency multiplexing techniques. The device is fabricated using a single thin-film layer of NbN, simplifying the fabrication process compared to existing magnetometer technologies considerably. Our experimental data, supported by theory, demonstrates a magnetometer having potential to replace established technology in applications requiring ultra-high sensitivity.

16 pages, 6 figures

References in corpus (3)

• Superconducting properties and Hall Effect of epitaxial NbN thin films
• Number fluctuations of sparse quasiparticles in a superconductor
• Microtesla MRI of the human brain combined with MEG

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• Electromagnetic Properties of Aluminum-based Bilayers for Kinetic Inductance Detectors