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arXiv · 1305.3863

MicroSQUIDs based on V/Cu/V Josephson nanojunctions

Alberto Ronzani·Matthieu Baillergeau·Carles Altimiras·Francesco Giazotto
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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/Phi_0 leading to promising magnetic flux resolution Phi_N < 3 microPhi_0 / 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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Alberto Ronzani, Matthieu Baillergeau, Carles Altimiras, Francesco Giazotto. 2013-05-16. MicroSQUIDs based on V/Cu/V Josephson nanojunctions. https://doi.org/10.1063/1.4817013

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