Open AccessOptimal SQUID Loop Size in Arrays of HTS SQUIDs
Author(s) -
Denis Crété,
Yves Lemaı̂tre,
B. Marcilhac,
Eliana Recoba-Pawlowski,
Juan Trastoy,
C. Ulysse
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1559/1/012012
Subject(s) - squid , magnetometer , superconductivity , inductance , josephson effect , scanning squid microscopy , wideband , dynamic range , condensed matter physics , magnetic field , yttrium barium copper oxide , materials science , magnetic flux , limit (mathematics) , high temperature superconductivity , physics , gradiometer , optics , biology , mathematics , ecology , mathematical analysis , quantum mechanics , voltage
Arrays of Superconducting interference devices (SQUIDs) deserve much attention for high frequency magnetic field detection because of the combined advantages of wideband radiofrequency operation and improved dynamic range compared to single SQUID magnetometers. Indeed, in principle the dynamic range should scale as the square root of the number of SQUIDs. It is well-known that the size of a SQUID designed for magnetometry has an optimum resulting from a trade-off between large magnetic flux in its loop and small loop inductance. Among the factors affecting this optimum when using arrays of SQUIDs, we discuss the impact of Josephson junction characteristic dispersion, experimentally observed with high temperature superconductors (HTS) and wideband requirement. Both limit the SQUID size to lower values, in particular for arrays of SQUIDs connected in series.