A new family of field-stable and highly sensitive SQUID current sensors based on sub-micrometer cross-type Josephson junctions. (14th June 2017)

• Record Type: Journal Article
• Authors: Schmelz, M; Zakosarenko, V; Schönau, T; Anders, S; Kunert, J; Meyer, M; Meyer, H-G; Stolz, R
• Is Part Of: Superconductor science & technology. Volume 30:Number 7(2017:Jul.)
• Publication Date: 2017-06-14
• Subjects: SQUIDs -- cross-type Josephson junction -- current sensor -- energy resolution -- magnetic field stability; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aa7216
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We report on the development of a new family of superconducting quantum interference device (SQUID) current sensors based on sub-micron cross-type Josephson tunnel junctions. Their low total junction capacitance permits high usable voltage swings of more than 100 μ V and exceptional low noise of the SQUIDs at 4.2 K. Integrated rf-filters as well as high tolerable background fields during cool-down of up to 9.6 mT enable their highly reliable and easy use. With input coil inductances ranging from 10 nH to 2.8 μ H and current sensitivities and coupled energy resolution down to 65 fA Hz –1/2 and below 10 h, respectively, they are a versatile tool for numerous applications.