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

Abstract

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.

Authors:
ORCiD logo; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1595311
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Sensors
Additional Journal Information:
Journal Volume: 20; Journal Issue: 1; Journal ID: ISSN 1424-8220
Publisher:
MDPI AG
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Davis, Samantha I., Kirtley, John R., and Moler, Kathryn A. Influence of Resonances on the Noise Performance of SQUID Susceptometers. United States: N. p., 2019. Web. doi:10.3390/s20010204.
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Davis, Samantha I., Kirtley, John R., & Moler, Kathryn A. Influence of Resonances on the Noise Performance of SQUID Susceptometers. United States. doi:10.3390/s20010204.
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Davis, Samantha I., Kirtley, John R., and Moler, Kathryn A. Mon . "Influence of Resonances on the Noise Performance of SQUID Susceptometers". United States. doi:10.3390/s20010204. https://www.osti.gov/servlets/purl/1595311.
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@article{osti_1595311,
title = {Influence of Resonances on the Noise Performance of SQUID Susceptometers},
author = {Davis, Samantha I. and Kirtley, John R. and Moler, Kathryn A.},
abstractNote = {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.},
doi = {10.3390/s20010204},
journal = {Sensors},
number = 1,
volume = 20,
place = {United States},
year = {2019},
month = {12}
}
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DOI:  10.3390/s20010204
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