Micro-superconducting quantum interference devices based on V/Cu/V Josephson nanojunctions

Alberto Ronzani; Matthieu Baillergeau; Carles Altimiras; Francesco Giazotto

doi:10.1063/1.4817013

Micro-superconducting quantum interference devices based on V/Cu/V Josephson nanojunctions

Alberto Ronzani (Corresponding Author), Matthieu Baillergeau, Carles Altimiras, Francesco Giazotto

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

18 Citations (Scopus)

Abstract

We report on the fabrication and characterization of micrometer-sized superconducting quantum interference devices (SQUIDs) 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 DC SQUIDs, these devices obtain flux-to-voltage transfer function values as high as 450 μV/Φ₀ leading to promising magnetic flux resolution Φ_N < 3 μ Φ₀/√Hz, being here limited by the room temperature preamplification stage. Significant improvement in the flux noise performance figures is expected with the adoption of cryogenic preamplification. The presented devices are suitable for operation as small-area SQUIDs at sub-Kelvin temperature, but their design can also be upscaled to include input coils enabling their use as sensitive magnetometers via the adoption of optimized electronic readout stages based on flux feedback schemes.

Original language	English
Article number	052603
Journal	Applied Physics Letters
Volume	103
Issue number	5
DOIs	https://doi.org/10.1063/1.4817013
Publication status	Published - 29 Jul 2013
MoE publication type	A1 Journal article-refereed

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abstract = "We report on the fabrication and characterization of micrometer-sized superconducting quantum interference devices (SQUIDs) 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 DC SQUIDs, these devices obtain flux-to-voltage transfer function values as high as 450 μV/Φ0 leading to promising magnetic flux resolution ΦN < 3 μ Φ0/√Hz, being here limited by the room temperature preamplification stage. Significant improvement in the flux noise performance figures is expected with the adoption of cryogenic preamplification. The presented devices are suitable for operation as small-area SQUIDs at sub-Kelvin temperature, but their design can also be upscaled to include input coils enabling their use as sensitive magnetometers via the adoption of optimized electronic readout stages based on flux feedback schemes.",

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