Influence of Resonances on the Noise Performance of SQUID Susceptometers

Davis, Samantha I.; Kirtley, John R.; Moler, Kathryn A.

doi:10.3390/s20010204

Title: Influence of Resonances on the Noise Performance of SQUID Susceptometers

Journal Article · 30 December 2019 · Sensors

DOI: https://doi.org/10.3390/s20010204 · OSTI ID:1595311

^[1]; Kirtley, John R. ^[2]; Moler, Kathryn A. ^[3]

Stanford Univ., CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
Stanford Univ., CA (United States); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)

Scanning Superconducting Quantum Interference Device (SQUID) Susceptometry simultaneously images the local magnetic fields and susceptibilities above a sample with sub-micron spatial resolution. Further development of this technique requires a thorough understanding of the current, voltage, and flux ( I V Φ ) characteristics of scanning SQUID susceptometers. These sensors often have striking anomalies in their current–voltage characteristics, which we believe to be due to electromagnetic resonances. The effect of these resonances on the performance of these SQUIDs is unknown. To explore the origin and impact of the resonances, we develop a model that qualitatively reproduces the experimentally-determined I V Φ characteristics of our scanning SQUID susceptometers. We use this model to calculate the noise characteristics of SQUIDs of different designs. We find that the calculated ultimate flux noise is better in susceptometers with damping resistors that diminish the resonances than in susceptometers without damping resistors. Such calculations will enable the optimization of the signal-to-noise characteristics of scanning SQUID susceptometers.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1595311

Journal Information:: Sensors, Vol. 20, Issue 1; ISSN 1424-8220

Publisher:: MDPI AGCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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References (36)

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Dc superconducting quantum interference device amplifier for gravitational wave detectors with a true noise temperature of 16 μK Vinante, Andrea; Mezzena, Renato; Prodi, Giovanni Andrea Applied Physics Letters, Vol. 79, Issue 16 https://doi.org/10.1063/1.1408276	journal	October 2001
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Fundamental studies of superconductors using scanning magnetic imaging Kirtley, J. R. Reports on Progress in Physics, Vol. 73, Issue 12 https://doi.org/10.1088/0034-4885/73/12/126501	journal	November 2010
DC SQUID series array amplifiers with 120 MHz bandwidth (corrected) Huber, M. E.; Neil, P. A.; Benson, R. G. IEEE Transactions on Appiled Superconductivity, Vol. 11, Issue 2 https://doi.org/10.1109/77.947383	journal	June 2001
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Title: Influence of Resonances on the Noise Performance of SQUID Susceptometers

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