DocumentCode
1500798
Title
Preparation and performance of toroidal Y1Ba2Cu3O7-x-RF SQUIDs
Author
Zhang, Y. ; Diegel, M. ; Heiden, C.
Author_Institution
Inst. fuer Angewandte Phys., Justus-Liebig-Univ., Giessen, West Germany
Volume
25
Issue
2
fYear
1989
fDate
3/1/1989 12:00:00 AM
Firstpage
869
Lastpage
871
Abstract
Starting from disk-shaped bulk specimens of Y1Ba2 Cu3O7-x with T c near 90 K, RF SQUIDs (superconducting quantum interference devices) to toroidal topology with a permanently adjusted mill-bridge contact were prepared. Contact trimming was done by reducing the cross section so that a good SQUID signal was obtained at 77 K. The SQUIDs were sealed after the adjustment in order to prevent degradation by moisture. Using conventional 20-MHz readout electronics the SQUIDs were operated in the flux-locked loop mode. Flux noise of the order of 10-4 Φ 0/√Hz was obtained at 77 K in the white region of the spectrum, with excess noise below about 100 Hz. The devices are quite robust due to their monolithic structure and demonstrate good stability against thermal cycling
Keywords
SQUIDs; barium compounds; electron device noise; high-temperature superconductors; yttrium compounds; RF SQUIDs; Y1Ba2Cu3O7-x; contact trimming; flux noise; flux-locked loop mode; high temperature superconductor; monolithic structure; permanently adjusted mill-bridge contact; thermal cycling stability; toroidal topology; white region; Circuit topology; Degradation; Moisture; Radio frequency; Radiofrequency interference; Readout electronics; Robust stability; SQUIDs; Superconducting device noise; Superconducting devices;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.92837
Filename
92837
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