Real-Space Probing of the Local Magnetic Response of Thin-Film Superconductors Using Single Spin Magnetometry

Authors: Dominik Rohner, Lucas Thiel, Benedikt Müller, Mark Kasperczyk, Reinhold Kleiner, Dieter Koelle and Patrick Maletinsky

Sensors 2018, 18, 3790

Abstract:

We report on direct, real-space imaging of the stray magnetic field above a micro-scale disc of a thin film of the high-temperature superconductor YBa2Cu3O7−δ (YBCO) using scanning single spinmagnetometry. Ourexperimentsyieldadirectmeasurementofthesample’sLondonpenetration depth and allow for a quantitative reconstruction of the supercurrents flowing in the sample as a result of Meissner screening. These results show the potential of scanning single spin magnetometry for studies of the nanoscale magnetic properties of thin-film superconductors, which could be readily extended to elevated temperatures or magnetic fields.