Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Superconducting Electronics: SQUIDs, Circuit QED
TT 35.2: Vortrag
Mittwoch, 20. März 2024, 09:45–10:00, H 2053
Nb constriction-Josephson-junction nanoSQUIDs on cantilevers patterned by He and Ne focused ion beams — •Jan Ullmann1, Timur Griener1, Simon Koch1, Simon Pfander1, Chloé Bureau-Oxton2, Daniel Jetter3, Andriani Vervelaki3, Kousik Bagani3, Ute Drechsler2, Oliver Kieler4, Reinhold Kleiner1, Martino Poggio3, Armin Knoll2, and Dieter Koelle1 — 1Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, Germany — 2IBM Research Europe, Zürich, Rüschlikon, Switzerland — 3Department of Physics and Swiss Nanoscience Institute, University of Basel, Switzerland — 4Department Quantum Electronics, Physikalisch-Technische Bundesanstalt, 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). We present our attempts to use He/Ne-FIB for fabricating Nb 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. We address the possibility to implement multi-terminal, multi-cJJ SQUIDs 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 and challenges of this project to combine SSM and AFM on the nanoscale.
Keywords: SQUID; nanoSQUID; cantilever; scanning SQUID microscopy; focused ion beam