Next Article in Journal
Data Query Mechanism Based on Hash Computing Power of Blockchain in Internet of Things
Next Article in Special Issue
Identification of Tiny Surface Cracks in a Rugged Weld by Signal Gradient Algorithm Using the ACFM Technique
Previous Article in Journal
An Online Charging Scheme for Wireless Rechargeable Sensor Networks Based on a Radical Basis Function
Previous Article in Special Issue
PT-Level High-Sensitivity Magnetic Sensor with Amorphous Wire
Open AccessArticle

Influence of Resonances on the Noise Performance of SQUID Susceptometers

by Samantha I. Davis 1,2,*,†, John R. Kirtley 3,† and Kathryn A. Moler 1,3,4,5
Department of Physics, Stanford University, Stanford, CA 94305-4045, USA
California Institute of Technology—The Division of Physics, Mathematics and Astronomy, 1200 E California Blvd, Pasadena, CA 91125, USA
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA
Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2020, 20(1), 204;
Received: 4 November 2019 / Revised: 23 December 2019 / Accepted: 27 December 2019 / Published: 30 December 2019
(This article belongs to the Special Issue Advanced Magnetic Sensors and Their Applications)
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. View Full-Text
Keywords: SQUID; susceptometers; noise; scanning SQUID; susceptometers; noise; scanning
Show Figures

Figure 1

MDPI and ACS Style

Davis, S.I.; Kirtley, J.R.; Moler, K.A. Influence of Resonances on the Noise Performance of SQUID Susceptometers. Sensors 2020, 20, 204.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop