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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Controllable morphology of flux avalanches in microstructured superconductors

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Author(s):
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Motta, M. [1] ; Colauto, F. [1] ; Vestgarden, J. I. [2] ; Fritzsche, J. [3] ; Timmermans, M. [4] ; Cuppens, J. [4] ; Attanasio, C. [5, 6] ; Cirillo, C. [5, 6] ; Moshchalkov, V. V. [4] ; de Vondel, J. Van [4] ; Johansen, T. H. [2, 7] ; Ortiz, W. A. [1] ; Silhanek, A. V. [8]
Total Authors: 13
Affiliation:
[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Paulo - Brazil
[2] Univ Oslo, Dept Phys, N-0316 Oslo - Norway
[3] Chalmers, Dept Appl Phys, S-41296 Gothenburg - Sweden
[4] Katholieke Univ Leuven, Nanoscale Superconduct & Magnetism Grp, Inst Nanoscale Phys & Chem, B-3001 Louvain - Belgium
[5] Univ Salerno, CNR SPIN Salerno, I-84084 Fisciano, Sa - Italy
[6] Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, Sa - Italy
[7] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522 - Australia
[8] Univ Liege, Dept Phys, B-4000 Sart Tilman Par Liege - Belgium
Total Affiliations: 8
Document type: Journal article
Source: Physical Review B; v. 89, n. 13 APR 14 2014.
Web of Science Citations: 18
Abstract

The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a treelike structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more difficult experimental access, such as the local values of temperature and electric field. (AU)

FAPESP's process: 07/08072-0 - Fundamental research in superconductivity and magnetism - systems potentially useful for aplications: advanced oxides and superconductors patterned with artificial structures
Grantee:Wilson Aires Ortiz
Support type: Research Projects - Thematic Grants