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.
| Original language | English |
|---|---|
| Article number | 052603 |
| Journal | Applied Physics Letters |
| Volume | 103 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 29 Jul 2013 |
| MoE publication type | A1 Journal article-refereed |
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Micro-superconducting quantum interference devices based on V/Cu/V Josephson nanojunctions. / Ronzani, Alberto (Corresponding Author); Baillergeau, Matthieu; Altimiras, Carles; Giazotto, Francesco.
In: Applied Physics Letters, Vol. 103, No. 5, 052603, 29.07.2013.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Micro-superconducting quantum interference devices based on V/Cu/V Josephson nanojunctions
AU - Ronzani, Alberto
AU - Baillergeau, Matthieu
AU - Altimiras, Carles
AU - Giazotto, Francesco
PY - 2013/7/29
Y1 - 2013/7/29
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84882399514&partnerID=8YFLogxK
U2 - 10.1063/1.4817013
DO - 10.1063/1.4817013
M3 - Article
AN - SCOPUS:84882399514
VL - 103
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 5
M1 - 052603
ER -