SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Magnetic Information Technology, Recording, Sensing

MA 49.3: Vortrag

Freitag, 31. März 2023, 10:00–10:15, HSZ 403

Towards nanomechanical detection of fT magnetic fields — Dhavalkumar Mungpara, Torben Hänke, and •Alexander Schwarz — Institute of Nanostructure and Solid State Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg

This work has been conducted in the framework of the OXiNEMS project that aims to establish etching protocols for oxides similar to those nowadays available for silicon and to develop a novel all-oxide nano-mechanical sensor to detect bio-magnetic field in the fT-regime required for magnetoencephalography (MEG).

Our envisaged hybrid sensor consists of a superconducting loop with a constriction that functions as field-to-gradient converter and a magnetically sensitive mechanical resonator that detects the Oersted field above the constriction. To increase the signal above the thermal noise limit we present an optimized constriction-resonator arrangement that encompasses a spiral geometry instead of a single constriction. This optimized geometry, can be fabricated using up-to date technology and should be able reach a sensitivity of 10 fT/√Hz at 77 K.

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. The author gratefully acknowledges the fruitful discussions with all members of the consortium, particularly Luca Pellegrino, Stefania Della Penna, Alexei Kalaboukhov, Federico Maspero, Nicola Manca, Simone Cuccurullo, Warner Venstra, Daniele Marré and Riccardo Bertacco.