Relaxation oscillation SQUIDs with high dV/dfi


Adelerhof, D.J. and Nijstad, H. and Flokstra, J. and Rogalla, H. (1993) Relaxation oscillation SQUIDs with high dV/dfi. IEEE Transactions on Applied Superconductivity, 3 (1, Par). pp. 1862-1865. ISSN 1051-8223

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Abstract:Relaxation oscillation SQUIDs (ROSs) based on Nb/Al, AlOx /Al/Nb Josephson tunnel junctions have been designed and fabricated. The hysteretic SQUIDs (superconducting quantum interference devices) have a maximum critical current of about 130 μA and an inductance of 20 pH. A voltage modulation of 40 μV and a flux to voltage transfer δV/δΦ of 4 MV/Φ0 have been measured in these SQUIDs. Double relaxation oscillation SQUIDs (DROSs), which are based on two hysteretic SQUIDs, showed transfer coefficients up to 77 mV/Φ0. The intrinsic white flux noise of the DROSs is smaller than 3-5 μΦ 0/√Hz. It is noted that the results are very promising for a next generation of SQUID systems with simplified read-out.
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Copyright:©1993 IEEE
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