High Sensitivity Magnetic Flux Sensors with Direct Voltage Readout: Double Relaxation Oscillation SQUIDs

D.J. Adelerhof, M.J. van Duuren, J. Flokstra, H. Rogalla, J. Kawai, H. Kado

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Abstract

The experimental sensitivity of double relaxation oscillation SQUIDs (DROSs) has been compared with theory and with the results obtained by numerical simulations. The experimental sensitivity ranges from 60 to 13h, where h is Planck's constant, for relaxation frequencies from 0.4 up to 10 GHz. For low frequencies the DROS characteristics can be explained by thermal noise on the critical currents. For high frequencies, the voltage-flux characteristics and the sensitivity are limited by the plasma frequency. The cross-over frequency is at 2 GHz, which is about 2% of the plasma frequency of the DROSs
Original languageEnglish
Pages (from-to)2160-2163
JournalIEEE transactions on applied superconductivity
Volume5
Issue number5
DOIs
Publication statusPublished - 1995
Event1994 Applied Superconductivity Conference, ASC 1994 - Boston, United States
Duration: 15 Oct 199420 Oct 1994

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