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
Link To Document :
