A low noise DC-SQUID based on NB/Al-AlOx/Nb Josephson junctions

Leif Grönberg; Heikki Seppä; Robin Cantor; Mikko Kiviranta; Tapani Ryhänen; Jorma Salmi; Ilkka Suni

doi:10.1007/978-3-642-77457-7_50

A low noise DC-SQUID based on NB/Al-AlO_x/Nb Josephson junctions

Leif Grönberg, Heikki Seppä, Robin Cantor, Mikko Kiviranta, Tapani Ryhänen, Jorma Salmi, Ilkka Suni

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Abstract

Low noise dc SQUIDs based on a Nb/Al-AlO_x/Nb Josephson junction technology have been developed. The design has been optimized for improved control of the resonances. An eight-level process has been used for device fabrication. Flux noise levels of 2.8×10⁻⁷Φ₀/√Hz at 1 kHz and 1.5×10⁻⁶Φ₀/√Hz at 1 Hz have been measured for an integrated SQUID magnetometer having 3 μm² junctions, a 12-turn input coil, and a dc SQUID inductance L_dc =11 pH.

Original language	English
Title of host publication	Superconducting Devices and Their Applications
Subtitle of host publication	Proceedings of the 4th International Conference SQUID ’91
Editors	Hans Koch, Heinz Lübbig
Place of Publication	Berlin
Publisher	Springer
Pages	281-285
ISBN (Electronic)	978-3-642-77457-7
ISBN (Print)	978-3-642-77459-1
DOIs	https://doi.org/10.1007/978-3-642-77457-7_50
Publication status	Published - 1991
MoE publication type	A4 Article in a conference publication
Event	4th International Conference SQUID ’91 - Berlin, Germany Duration: 18 Jun 1992 → 21 Jun 1992

Publication series

Series	Springer Proceedings in Physics
Volume	64
ISSN	0930-8989

Conference

Conference	4th International Conference SQUID ’91
Country/Territory	Germany
City	Berlin
Period	18/06/92 → 21/06/92

Keywords

Josephson junction
SQUID

Access to Document

10.1007/978-3-642-77457-7_50

Cite this

Grönberg, L., Seppä, H., Cantor, R., Kiviranta, M., Ryhänen, T., Salmi, J., & Suni, I. (1991). A low noise DC-SQUID based on NB/Al-AlO_x/Nb Josephson junctions. In H. Koch, & H. Lübbig (Eds.), Superconducting Devices and Their Applications: Proceedings of the 4th International Conference SQUID ’91 (pp. 281-285). Springer. Springer Proceedings in Physics Vol. 64 https://doi.org/10.1007/978-3-642-77457-7_50

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title = "A low noise DC-SQUID based on NB/Al-AlOx/Nb Josephson junctions",

abstract = "Low noise dc SQUIDs based on a Nb/Al-AlOx/Nb Josephson junction technology have been developed. The design has been optimized for improved control of the resonances. An eight-level process has been used for device fabrication. Flux noise levels of 2.8×10−7Φ0/√Hz at 1 kHz and 1.5×10−6Φ0/√Hz at 1 Hz have been measured for an integrated SQUID magnetometer having 3 μm2 junctions, a 12-turn input coil, and a dc SQUID inductance Ldc =11 pH.",

keywords = "Josephson junction, SQUID",

author = "Leif Gr{\"o}nberg and Heikki Sepp{\"a} and Robin Cantor and Mikko Kiviranta and Tapani Ryh{\"a}nen and Jorma Salmi and Ilkka Suni",

year = "1991",

doi = "10.1007/978-3-642-77457-7_50",

language = "English",

isbn = "978-3-642-77459-1",

series = "Springer Proceedings in Physics",

publisher = "Springer",

pages = "281--285",

editor = "Hans Koch and Heinz L{\"u}bbig",

booktitle = "Superconducting Devices and Their Applications",

address = "Germany",

note = "4th International Conference SQUID {\textquoteright}91 ; Conference date: 18-06-1992 Through 21-06-1992",

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Grönberg, L, Seppä, H, Cantor, R, Kiviranta, M, Ryhänen, T, Salmi, J & Suni, I 1991, A low noise DC-SQUID based on NB/Al-AlO_x/Nb Josephson junctions. in H Koch & H Lübbig (eds), Superconducting Devices and Their Applications: Proceedings of the 4th International Conference SQUID ’91. Springer, Berlin, Springer Proceedings in Physics, vol. 64, pp. 281-285, 4th International Conference SQUID ’91, Berlin, Berlin, Germany, 18/06/92. https://doi.org/10.1007/978-3-642-77457-7_50

A low noise DC-SQUID based on NB/Al-AlO_x/Nb Josephson junctions. / Grönberg, Leif; Seppä, Heikki; Cantor, Robin et al.

Superconducting Devices and Their Applications: Proceedings of the 4th International Conference SQUID ’91. ed. / Hans Koch; Heinz Lübbig. Berlin : Springer, 1991. p. 281-285 (Springer Proceedings in Physics, Vol. 64).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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AB - Low noise dc SQUIDs based on a Nb/Al-AlOx/Nb Josephson junction technology have been developed. The design has been optimized for improved control of the resonances. An eight-level process has been used for device fabrication. Flux noise levels of 2.8×10−7Φ0/√Hz at 1 kHz and 1.5×10−6Φ0/√Hz at 1 Hz have been measured for an integrated SQUID magnetometer having 3 μm2 junctions, a 12-turn input coil, and a dc SQUID inductance Ldc =11 pH.

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Grönberg L, Seppä H, Cantor R, Kiviranta M, Ryhänen T, Salmi J et al. A low noise DC-SQUID based on NB/Al-AlO_x/Nb Josephson junctions. In Koch H, Lübbig H, editors, Superconducting Devices and Their Applications: Proceedings of the 4th International Conference SQUID ’91. Berlin: Springer. 1991. p. 281-285. (Springer Proceedings in Physics, Vol. 64). doi: 10.1007/978-3-642-77457-7_50