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TT: Fachverband Tiefe Temperaturen
TT 37: Superconducting Electronics: SQUIDs, Qubits, Circuit QED
TT 37.1: Vortrag
Freitag, 9. September 2022, 09:30–09:45, H22
Nb constriction Josephson junctions and nanoSQUIDs patterned by He and Ne focused ion beams — •Simon Pfander1, Timur Griener1, Julian Linek1, Thomas Weimann2, Ute Drechsler3, Reinhold Kleiner1, Armin Knoll3, Oliver Kieler2, and Dieter Koelle1 — 1Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, 72076 Tübingen, Germany — 2Department Quantum Electronics, Physikalisch-Technische Bundesanstalt (PTB), 38116 Braunschweig, Germany — 3IBM Research Europe – Zürich, 8803 Rüschlikon, Switzerland
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) and 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). 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).