SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 39: Superconducting Electronics
TT 39.8: Talk
Wednesday, March 29, 2023, 17:15–17:30, HSZ 304
Nb SQUIDs patterned by He and Ne focused ion beams — •Simon Koch1, Timur Griener1, Simon Pfander1, Julian Linek1, Thomas Weimann2, Reinhold Kleiner1, Oliver Kieler2, and Dieter Koelle1 — 1Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, Germany — 2Department Quantum Electronics, Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
Nanopatterning of superconducting thin film structures with focused He or Ne ion beams (He/Ne-FIB) offers a flexible tool for creating constriction-type Josephson junctions (cJJs) which can be integrated into strongly miniaturized superconducting quantum interference devices (nanoSQUIDs) for magnetic sensing on the nanoscale. We present our attempts to use He/Ne-FIB for fabricating Nb cJJs and nanoSQUIDs which shall provide ultra-low noise and high spatial resolution for their application in scanning SQUID microscopy (SSM). Moreover, we address the possibility to implement multiterminal, multi-JJ SQUIDs that provide flexibility in SQUID readout. The nanoSQUIDs are designed as sensors for magnetic flux and dissipation. They shall be integrated on custom-made Si cantilevers, which will provide the possibility of simultaneous conventional topographic imaging by atomic force microscopy (AFM). We will discuss the status of this project and challenges that have to be met on the way to combine SSM and AFM on the nanoscale.
We acknowledge the European Commission under H2020 FET Open grant FIBsuperProbes (number 892427).