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 · 29 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); SLAC
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, Journal Name: Sensors Journal Issue: 1 Vol. 20; ISSN SENSC9; ISSN 1424-8220

Publisher:: MDPI AGCopyright Statement

Country of Publication:: United States

Language:: English

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Scanning μ-superconduction quantum interference device force microscope Veauvy, C.; Hasselbach, K.; Mailly, D. Review of Scientific Instruments, Vol. 73, Issue 11 https://doi.org/10.1063/1.1515384	journal	November 2002
Gradiometric micro-SQUID susceptometer for scanning measurements of mesoscopic samples Huber, Martin E.; Koshnick, Nicholas C.; Bluhm, Hendrik Review of Scientific Instruments, Vol. 79, Issue 5 https://doi.org/10.1063/1.2932341	journal	May 2008
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Title: Influence of Resonances on the Noise Performance of SQUID Susceptometers

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