Control of the effective value of the critical current of the RF SQUID by the high-frequency electromagnetic field

An analysis of the influence of the high-frequency electromagnetic field on the amplitude-frequency and signal characteristics of RF SQUID and experimental verification are carried out. At low parameter β L, the RF SQUID behavior is well described analytically by the theoretical model. In experiment...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2024-06, Vol.50 (6), p.497-501
Main Authors: Shnyrkov, V. I., Lyakhno, V. Yu, Kalenyuk, О. A., Mindich, D. G., Leha, O. O., Shapovalov, A. P.
Format: Article
Language:English
Subjects:
Amplitudes
Critical current (superconductivity)
Electromagnetic fields
Parameters
Radio frequency
Resonance
Squid
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Summary:An analysis of the influence of the high-frequency electromagnetic field on the amplitude-frequency and signal characteristics of RF SQUID and experimental verification are carried out. At low parameter β L, the RF SQUID behavior is well described analytically by the theoretical model. In experiment, basic operation scheme is used in which the interferometer is inductively connected to a resonant circuit driven by RF current at a frequency close to the resonance frequency of the circuit. It is shown that parameter β L, which distinguishes between hysteretic and nonhysteretic regimes, can be effectively adjusted to a desired value by applying the high-frequency field of a certain amplitude and frequency much higher than circuit resonance frequency. A significant increase in the conversion factor and sensitivity of the RF SQUID during this adjustment is discussed.
ISSN:1063-777X
1090-6517
DOI:10.1063/10.0026089