Low-frequency flux noise in YBCO dc SQUIDs cooled in static magnetic fields

The low-frequency flux noise in bicrystal and step-edge YBa sub(2)Cu sub(3)O sub(x) dc SQUIDs has been investigated. The width, w, of the superconducting strips forming the SQUID frame was varied from 4 to 42 mu m. The SQUIDs were cooled in static magnetic fields up to 150 mu T. Two types of low-fre...

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Bibliographic Details
Published in:Superconductor science & technology 1999-11, Vol.12 (11), p.798-801, Article 798
Main Authors: Sager, M P, Petersen, P R E, Holst, T, Shen, Y Q, Hansen, J Bindslev
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
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Summary:The low-frequency flux noise in bicrystal and step-edge YBa sub(2)Cu sub(3)O sub(x) dc SQUIDs has been investigated. The width, w, of the superconducting strips forming the SQUID frame was varied from 4 to 42 mu m. The SQUIDs were cooled in static magnetic fields up to 150 mu T. Two types of low-frequency noise dominated, namely 1 /f-like noise and random telegraph noise giving a Lorentzian frequency spectrum. The 1/f noise performance of the w identical with 4, 6 and 7 mu m SQUIDs was almost identical, while the SQUIDs with w identical with 22 and 42 mu m showed an order of magnitude higher noise level. Our analysis of the data suggests an exponential increase of the 1/f noise versus the cooling field, exhibiting a characteristic magnetic field around 40 mu T.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/12/11/332