No full text
Unpublished conference/Abstract (Scientific congresses and symposiums)
Why are flux avalanches deflected by a metallic layer?
Brisbois, Jérémy
201515th International Workshop on Vortex Matter in Superconductors (Vortex 2015)
 

Files


Full Text
No document available.

Send to



Details



Keywords :
flux avalanches; eddy currents; magnetic braking; nanostructured superconductors
Abstract :
[en] Sudden avalanches of magnetic flux bursting into a superconducting sample are deflected from their trajectories when they encounter a conductive layer deposited on top of the superconductor. Remarkably, in some cases the flux is totally excluded from the area covered by the conductive layer. Even if this phenomenon has been known for a few years, there is currently no theoretical model describing it. Moreover, the question whether the deflection would also be observed for a single vortex entering the region covered by a metallic layer is still unanswered. In this work we use the magneto-optical imaging (MOI) technique, based on the Faraday effect, to show that a conductive layer (Cu) can repel flux avalanches triggered in an underlying superconducting film (Nb). We present a simple classical model that accounts for the deflection of a single vortex and considers a magnetic monopole approaching a semi-infinite conductive plane. This model suggests the important role played in the avalanche deflection by electromagnetic braking, arising from the eddy currents induced by the moving vortex in the metal. Moreover, we have found a decrease of the vortex damping coefficient due to the metallic sheet at large vortex velocities, correcting early theoretical descriptions where a linear behaviour was proposed.
Disciplines :
Physics
Author, co-author :
Brisbois, Jérémy ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
Why are flux avalanches deflected by a metallic layer?
Publication date :
15 May 2015
Event name :
15th International Workshop on Vortex Matter in Superconductors (Vortex 2015)
Event place :
El Escorial, Spain
Event date :
du 10 au 15 mai 2015
Audience :
International
Available on ORBi :
since 18 May 2015

Statistics


Number of views
34 (8 by ULiège)
Number of downloads
0 (0 by ULiège)

Bibliography


Similar publications



Contact ORBi