DocumentCode
1236389
Title
Multi channel high-Tc scanning SQUID microscope
Author
Matthews, J. ; Lee, S.Y. ; Wellstood, F.C. ; Gilbertson, A.F. ; Moore, G.E. ; Chatraphorn, S.
Author_Institution
Center for Supercond. Res., Univ. of Maryland, College Park, MD, USA
Volume
13
Issue
2
fYear
2003
fDate
6/1/2003 12:00:00 AM
Firstpage
219
Lastpage
222
Abstract
We have constructed and tested a multichannel scanning SQUID microscope. An array of up to 8 high-Tc YBCO SQUIDs are mounted on a single chip at the end of a 77 K cold finger. Each SQUID loop measures 30 μm by 60 μm, and the SQUID´s are spaced by about 200 μm. The normal to the surface of the chip (and the SQUID loop) is aligned parallel to the main scanning direction. A vacuum space and a thin (<25 μm) sapphire window separate the SQUID chip from the sample, which is in air at room-temperature. The microscope has been tested by imaging defects in wires and short circuits in computer chips. We discuss the advantages of the multichannel system over the single channel system, as well as some of the obstacles encountered.
Keywords
SQUIDs; barium compounds; high-temperature superconductors; magnetic sensors; microscopes; superconducting magnets; yttrium compounds; 200 micron; 30 micron; 60 micron; 77 K; YBCO; YBaCuO; cold finger; high-Tc scanning SQUID microscope; magnetic images; multichannel microscope; sapphire window; scanning direction; superconducting magnet wires; vacuum space; Circuit testing; Feedback; Fingers; Microscopy; SQUIDs; Spatial resolution; Superconducting magnets; Superconductivity; Wires; Yttrium barium copper oxide;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2003.813689
Filename
1211581
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