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Magnesium diboride superconducting quantum interference devices fabricated by focused ion beam

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9 Author(s)
Burnell, G. ; Dept. of Mater. Sci., Univ. of Cambridge, UK ; Tarte, E.J. ; Yates, K.A. ; Kang, Dae-Joon
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We have recently developed a technique for fabricating Superconductor-Normal-Superconductor (SNS) junctions in MgB2 thin films using a focused ion beam (FIB). These junctions show a strong modulation of the critical current by applied magnetic field and microwaves. We have made Superconducting Quantum Interference Devices (SQUIDs) with directly coupled pick-up loops using this technique which show large voltage modulations (∼200 μV at 6 K) and a white noise level of 15 μΦ0Hz-12/ at 5 kHz. In this work we present the latest results from our devices. We are studying the nature of the barrier created by our fabrication process and also report a preliminary Raman scattering and transport measurement study of resistors made with this technique.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

June 2003

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