Article (Scientific journals)
Metamorphosis of discontinuity lines and rectification of magnetic flux avalanches in the presence of noncentrosymmetric pinning forces
Motta, M.; Burger, Loïc; Jiang, L. et al.
2021In Physical Review. B, Condensed Matter and Materials Physics, 103, p. 224514
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Keywords :
Flux pinning; Magneto-optical effect; Ratchet effect; Superconductors; Finite element method; Ginzburg-Landau theory
Abstract :
[en] Considering a noncentrosymmetric pinning texture composed of a square array of triangular holes, the magnetic flux penetration and expulsion are investigated experimentally and theoretically. A direct visualization of the magnetic landscape obtained using a magneto-optical technique on a Nb film is complemented by a multiscale numerical modeling. This combined approach allows the magnetic flux dynamics to be identified from the single flux quantum limit up to the macroscopic electromagnetic response. Within the theoretical framework provided by time-dependent Ginzburg-Landau simulations, an estimation of the in-plane current anisotropy is obtained and its dependence with the radius of the curvature of hole vertices is addressed. These simulations show that current crowding plays an important role in channeling the flux motion, favoring hole-to-hole flux hopping rather than promoting interstitial flux displacement in between the holes. The resulting anisotropy of the critical current density gives rise to a distinct pattern of discontinuity lines for increasing and decreasing applied magnetic fields, in sharp contrast to the invariable patterns reported for centrosymmetric pinning potentials. This observation is partially accounted for by the rectification effect, as demonstrated by finite-element modeling. At low temperatures, where magnetic field penetration is dominated by thermomagnetic instabilities, highly directional magnetic flux avalanches with a fingerlike shape are observed to propagate along the easy axis of the pinning potential. This morphology is reproduced by numerical simulations. Our findings demonstrate that anisotropic pinning landscapes and, in particular, ratchet potentials produce subtle modifications to the critical state field profile that are reflected in the distribution of discontinuity lines.
Disciplines :
Physics
Author, co-author :
Motta, M. ;  Universidade Federal de São Carlos, São Paulo, Brazil > Departamento de Física
Burger, Loïc  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Jiang, L.;  Northwestern Polytechnical University, Xi’an, China > School of Aeronautics
González Acosta, J. L.;  Universidad del Magdalena, Santa Marta, Colombia > Facultad de Ingeniería
Jelic, Z. L.;  Nokia Bell Labs, Antwerp, Belgium
Colauto, F.;  Universidade Federal de São Carlos, São Paulo, Brazil > Departamento de Física
Ortiz, W. A.;  Universidade Federal de São Carlos, São Paulo, Brazil > Departamento de Física
Johansen, T. H.;  University of Oslo, Norway > Department of Physics
Miloševic, M. V.;  Universiteit Antwerpen, Antwerpen, Belgium > Department of Physics
Cirillo, C.;  Università degli Studi di Salerno, Fisciano (Sa), Italy > CNR-SPIN
Attanasio, C.;  Università degli Studi di Salerno, Fisciano (Sa), Italy > CNR-SPIN and Dipartimento di Fisica “E.R. Caianiello”
Xue, C.;  Northwestern Polytechnical University, Xi’an, China > 0School of Mechanics, Civil Engineering and Architecture, and MIIT Key Laboratory of Dynamics and Control of Complex Systems
Silhanek, Alejandro  ;  Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Vanderheyden, Benoît  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
More authors (4 more) Less
 These authors have contributed equally to this work.
Language :
English
Title :
Metamorphosis of discontinuity lines and rectification of magnetic flux avalanches in the presence of noncentrosymmetric pinning forces
Publication date :
09 June 2021
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society, United States - Maryland
Volume :
103
Pages :
224514
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
COST action CA19108
Available on ORBi :
since 19 June 2021

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