Reference : Model for the penetration of magnetic flux in Nb superconducting films with lithograp...
Scientific congresses and symposiums : Unpublished conference/Abstract
Engineering, computing & technology : Electrical & electronics engineering
http://hdl.handle.net/2268/217263
Model for the penetration of magnetic flux in Nb superconducting films with lithographically defined indentations and defects due to inhomogeneities
English
Vanderheyden, Benoît mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes >]
Avila Osses, Jonathan [Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés >]
Brisbois, Jérémy [Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés >]
Burger, Loïc [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes >]
Nguyen, Ngoc Duy [Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures >]
Silhanek, Alejandro [Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés >]
31-Aug-2017
No
International
IUMRS-ICAM 2017, 15th International Conference on Advanced Materials
from August 27, 2017 to September 1, 2017
The Material Research Society of Japan
Kyoto
Japon
[en] Magnetic flux penetration ; Superconductor films ; Defects
[en] We consider the penetration of magnetic flux perpendicularly to a Nb superconducting film containing edge indentations and/or defects. The induced currents undergo an abrupt change of direction around the indentations and the defects, giving rise to discontinuity lines (d-lines). It has recently been shown, by means of magneto-optical imaging and numerical models, that the detailed structure of the d-lines generated with lithographically-defined micro-indentations carry information about their size and shape, and vary with temperature [1]. In this talk, we describe the models which can be used to describe the d-lines and discuss the effects of temperature, demagnetization, and flux creep, as well as the influence of a field-dependent critical current density on the distribution of the magnetic field. We extend the model to discontinuities produced by defects arising from inhomogeneous properties of the film and discuss the information contained in the resulting d-line structure. Last, in contrast to what has been repeatedly predicted in the literature, artificial indentations were not observed to act as preferred nucleation spots for flux avalanches [1]. To investigate this result, we estimate the levels of electric field strengthening arising near indentations and defects, and compare with the levels necessary for triggering thermomagnetic instabilities.
Communauté française de Belgique - CfB
ARC 13/18-08
http://hdl.handle.net/2268/217263
References: [1] J. Brisbois et. al., Phys. Rev. B. 93 (2016) 054521.

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