High- \rm} Dual-SQUIDs With Graphoepitaxial Step-Edge Junctions

The microstructural and noise properties of serially connected high- \mathrm{T}_{\mathrm{c}} dc superconducting quantum interferometer devices (high- \mathrm{T}_{\mathrm{c}} dc SQUIDs) with step-edge Josephson junctions are studied. It is shown that the implementation of novel graphoepitaxial step...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2016-04, Vol.26 (3), p.1-4
Main Authors: Faley, M. I., Slobodchikov, V. Yu, Maslennikov, Yu. V., Koshelets, V. P., Dunin-Borkowski, R. E.
Format: Article
Language:English
Subjects:
High-temperature superconductors
Ion beams
Josephson junctions
Magnetic sensors
Magnetic tunneling
Magnetometers
SQUIDs
Substrates
Superconducting magnets
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Summary:The microstructural and noise properties of serially connected high- \mathrm{T}_{\mathrm{c}} dc superconducting quantum interferometer devices (high- \mathrm{T}_{\mathrm{c}} dc SQUIDs) with step-edge Josephson junctions are studied. It is shown that the implementation of novel graphoepitaxial step-edge Josephson junctions on buffered MgO substrates helps to overcome poor reproducibility of conventional step-edge high- \mathrm{T}_{\mathrm{c}} Josephson junctions due to the self-arranged growth of two identical [100]-tilted 45 ^{\circ} grain boundaries over a wide range of step heights. The use of such Josephson junctions in two serially connected SQUIDs that are directly coupled to a common pickup loop in a dual-SQUID configuration with current biasing of the individual SQUIDs results in a doubling of voltage swings and an improvement in magnetic field resolution of the sensors.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2515841