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Title: Nano-superconducting quantum interference devices with suspended junctions

Nano-Superconducting Quantum Interference Devices (nano-SQUIDs) are usually fabricated from a single layer of either Nb or Al. We describe here a simple method for fabricating suspended nano-bridges in Nb/Al thin-film bilayers. We use these suspended bridges, which act as Josephson weak links, to fabricate nano-SQUIDs which show critical current oscillations at temperatures up to 1.5 K and magnetic flux densities up to over 20 mT. These nano-SQUIDs exhibit flux modulation depths intermediate between all-Al and all-Nb devices, with some of the desirable characteristics of both. The suspended geometry is attractive for magnetic single nanoparticle measurements.
Authors:
;  [1] ;  [2]
  1. Institut Néel, CNRS and Université Joseph Fourier, 25 Avenue des Martyrs, Grenoble (France)
  2. Center for Probing the Nanoscale, Stanford University, Palo Alto, California 94305-4045 (United States)
Publication Date:
OSTI Identifier:
22262609
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRITICAL CURRENT; FLUX DENSITY; MAGNETIC FLUX; NANOSTRUCTURES; OSCILLATIONS; SQUID DEVICES; THIN FILMS