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Title: Proximity effect bilayer nano superconducting quantum interference devices for millikelvin magnetometry

Superconducting quantum interference devices (SQUIDs) incorporating thin film nanobridges as weak links have sensitivities approaching that required for single spin detection at 4.2‚ÄČK. However, due to thermal hysteresis they are difficult to operate at much lower temperatures which hinder their application to many quantum measurements. To overcome this, we have developed nanoscale SQUIDs made from titanium-gold proximity bilayers. We show that their electrical properties are consistent with a theoretical model developed for heat flow in bilayers and demonstrate that they enable magnetic measurements to be made on a sample at system temperatures down to 60 mK.
Authors:
; ;  [1] ; ;  [2]
  1. London Centre for Nanotechnology, University College London (UCL), 17-19 Gordon Street, London WC1H 0AH (United Kingdom)
  2. National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)
Publication Date:
OSTI Identifier:
22266196
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; DETECTION; ELECTRICAL PROPERTIES; GOLD; HEAT FLUX; HYSTERESIS; LAYERS; NANOSTRUCTURES; PROXIMITY EFFECT; SENSITIVITY; SPIN; SQUID DEVICES; THIN FILMS; TITANIUM