SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.36: Poster

Thursday, March 30, 2023, 14:00–16:00, P2/EG

Design and set-up of an optomechanical readout apparatus to characterize magnetic field sensors encompassing high-Q resonators down to 4 K — Torben Hänke, •Dhavalkumar Mungpara, and Alexander Schwarz — Institute of Nanostructure and Solid State Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg

This work has been conducted as part of the OXiNEMS project that aims to realize an miniaturized all-oxide hybrid sensor able to detect magnetic fields in the fT-regime. Our envisaged design encompasses a superconducting pick-up loop with a constriction and a magnetically sensitive high-Q resonator placed directly above it.

Here, we present a set-up to characterize the mechanical properties of potential resonators alone or already integrated into the hybrid sensor. To do so, the resonator motion is detected using an all-fiber interferometer inside a dip stick, which can be pumped to pressures below 10⁻⁶ mbar and cooled down to 4 K. Alignment between fiber and resonator in x-, y- and z-directions is done with remotely operated precision piezomotors. The resonator can be excited using an integrated shaker piezo to record amplitude and phase response curves. Without external excitation the power spectral density can be recorded and to test the performance of the complete hybrid sensor in operation, the frequency change of the resonator can be monitored.

The OXiNEMS project (www.oxinems.eu) has received funding from the European Union‘s Horizon 2020 research and innovation program under Grant Agreement No. 828784.