Nano-superconducting quantum interference devices with suspended junctions

Journal Article · Mon Apr 14 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4871317· OSTI ID:22262609

Hazra, D.; Hasselbach, K. ^[1]; Kirtley, J. R. ^[2]

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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)

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.

• OSTI ID: 22262609
• Journal Information: Applied Physics Letters, Vol. 104, Issue 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRITICAL CURRENT
FLUX DENSITY
MAGNETIC FLUX
NANOSTRUCTURES
OSCILLATIONS
SQUID DEVICES
THIN FILMS