MicroSQUIDs based on V/Cu/V Josephson nanojunctions

2013/05/16 by Alberto Ronzani, Matthieu Baillergeau, Carles Altimiras +1 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con

paper · pdf · doi:10.1063/1.4817013

published as Appl. Phys. Lett. 103, 052603 (2013) · 4.5 pages, 4 color figures

arxiv created 2013/05/16 · arxiv updated 2013/09/06

Abstract

We report on the fabrication and characterization of microSQUID devices based on nanoscale vanadium/copper/vanadium Josephson weak links. Magnetically driven quantum interference patterns have been measured for temperatures in the 0.24 - 2 K range. As magnetometers, these devices obtain flux-to-voltage transfer function values as high as 450 microV/Phi₀ leading to promising magnetic flux resolution Phi_N < 3 microPhi₀ / Hz^(1/2), being here limited by the room temperature preamplification stage. Significant improvements in the flux noise performance figures, which are already competitive with existing state-of-the-art commercial SQUIDs systems, are expected either with cryogenic preamplification or with the adoption of optimized electronic readout stages based on active feedback schemes.

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