Influence of resonances on the noise performance of SQUID susceptometers
| Autor: | Samantha Davis, John R. Kirtley, Kathryn A. Moler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
noise
Physics - Instrumentation and Detectors Physics::Medical Physics Flux FOS: Physical sciences 02 engineering and technology susceptometers lcsh:Chemical technology 01 natural sciences Biochemistry Noise (electronics) Article Analytical Chemistry law.invention Superconductivity (cond-mat.supr-con) scanning law Condensed Matter::Superconductivity 0103 physical sciences lcsh:TP1-1185 Electrical and Electronic Engineering 010306 general physics Instrumentation Image resolution Physics Condensed matter physics Condensed Matter - Superconductivity Instrumentation and Detectors (physics.ins-det) 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Magnetic field SQUID Computer Science::Programming Languages Resistor 0210 nano-technology squid Voltage |
| Zdroj: | Sensors, Vol 20, Iss 1, p 204 (2019) Sensors Volume 20 Issue 1 Sensors (Basel, Switzerland) |
| Popis: | 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 &Phi ) characteristics of scanning SQUID susceptometers. These sensors often have striking anomalies in their current&ndash 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 &Phi 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. |
| Databáze: | OpenAIRE |
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