DocumentCode
994790
Title
Observation of vortex structures in Josephson junctions by laser scanning
Author
Lhota, James R. ; Scheuermann, M. ; Kuo, P.K. ; Chen, J.T.
Author_Institution
Wayne State University, Detroit, MI
Volume
19
Issue
3
fYear
1983
fDate
5/1/1983 12:00:00 AM
Firstpage
1024
Lastpage
1026
Abstract
By scanning a focused laser beam (diameter 
m and < 1 mW) on Josephson tunnel junctions we observed variations in the zero-voltage current as a function of beam position. We believe that the laser beam at the appropriate power levels serves as a direct probe of the current distribution in the junction. Two types of factors contribute to the non-uniformity of the current distribution. The first is related to the intrinsic non-uniformity of the junction and the second is due to external parameters such as applied magnetic field and temperature. Using this technique, we have directly observed the formation of vortices in a junction in a magnetic field.
m and < 1 mW) on Josephson tunnel junctions we observed variations in the zero-voltage current as a function of beam position. We believe that the laser beam at the appropriate power levels serves as a direct probe of the current distribution in the junction. Two types of factors contribute to the non-uniformity of the current distribution. The first is related to the intrinsic non-uniformity of the junction and the second is due to external parameters such as applied magnetic field and temperature. Using this technique, we have directly observed the formation of vortices in a junction in a magnetic field.Keywords
Josephson devices; Laser applications, measurement; Current density; Current distribution; Glass; Josephson junctions; Laser beams; Laser theory; Magnetic field measurement; Magnetic fields; Probes; Voltage;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.1983.1062438
Filename
1062438
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