Article (Scientific journals)
Magnetic flux avalanches in Nb/NbN thin films
Pinheiro, Lincoln B.L.G.; Caputo, Marco; Cirillo, Carla et al.
2020In Low Temperature Physics, 46, p. 365
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Keywords :
Bi-layer; proximity effect; anti-avalanches; halo-like structure; crossing avalanches
Abstract :
[en] Technological applications of NbN thin films may be threatened by the development of magnetic flux avalanches of thermomagnetic origin appearing in a large portion of the superconducting phase. In this work we describe an approach to substantially suppress the magnetic flux avalanche regime, without compromising the upper critical field. This procedure consists of depositing a thin Nb layer before the reactive deposition of NbN, thus forming a bi-layered system. We use AC susceptibility and DC magnetometry to characterize both the single layer films, Nb and NbN, and the bi-layered specimen, as well as calibrated Magneto-Optical Imaging to map the instability regime of the studied samples. Magnetic flux imaging reveals interesting features of the dendritic flux avalanches in the bi-layer system, including halo-like patterns and crossing avalanches.
Disciplines :
Physics
Author, co-author :
Pinheiro, Lincoln B.L.G.;  Departamento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
Caputo, Marco;  Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di Salerno, FI-84084 Fisciano (Sa), Italy.
Cirillo, Carla;  Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di Salerno, FI-84084 Fisciano (Sa), Italy.
Attanasio, Carmine;  Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di Salerno, FI-84084 Fisciano (Sa), Italy.
Johansen, T.H.;  Department of Physics, University of Oslo, POB 1048, Blindern, 0316 Oslo, Norway
Ortiz, Wilson Aires;  Departamento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
Silhanek, Alejandro  ;  Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Motta, Maycon;  Departamento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
Language :
English
Title :
Magnetic flux avalanches in Nb/NbN thin films
Publication date :
2020
Journal title :
Low Temperature Physics
ISSN :
1063-777X
eISSN :
1090-6517
Publisher :
American Institute of Physics, United States - New York
Volume :
46
Pages :
365
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 December 2019

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