Study of Low-Frequency Noise Performance of Nanobridge-Based SQUIDs in External Magnetic Fields

We report on the low-frequency noise performance of niobium dc superconducting quantum interference devices (SQUIDs), which contain nanobridges fabricated by focused ion beam lithography as the active Josephson elements. The devices have feature sizes down to 70 nm. We have measured devices of diffe...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.1601004-1601004
Main Authors: Rozhko, S., Hino, T., Blois, A., Hao, L., Gallop, J. C., Cox, D. C., Romans, E. J.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Circuits of signal characteristics conditioning (including delay circuits)
Devices
Direct current
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Low-frequency noise
Magnetic field measurement
Magnetic field sensitivity
Microelectronic fabrication (materials and surfaces technology)
Molecular electronics, nanoelectronics
Nanocomposites
Nanomaterials
nanoscale superconducting quantum interference device (SQUID)
Nanostructure
Noise
Noise measurement
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SQUIDs
Superconducting devices
Superconducting quantum interference devices
Temperature measurement
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Summary:We report on the low-frequency noise performance of niobium dc superconducting quantum interference devices (SQUIDs), which contain nanobridges fabricated by focused ion beam lithography as the active Josephson elements. The devices have feature sizes down to 70 nm. We have measured devices of different loop sizes in two readout configurations: nano-scale loop sizes in small signal mode using a series SQUID array as a low-temperature pre-amplifier, and larger micron-scale loop sizes in a conventional flux-locked loop. We investigate the different contributions to the low frequency noise and report on electrical measurements made in applied magnetic fields of up to 0.5 T (in-plane) and 0.1 T (perpendicular to the plane) at operating temperatures around 7 K. We compare the measurements with the existing theories of noise in a dc SQUID.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2233537