Trapping Flux Avalanches in Nb Films by Circular Stop-Holes of Different Size

Autor(es)

Carmo, D. ^[1] ; Colauto, F. ^[1] ; de Andrade, A. M. H. ^[2] ; Oliveira, A. A. M. ^[3] ; Ortiz, W. A. ^[1] ; Johansen, T. H. ^{[4, 5]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS - Brazil

^[3] Inst Fed Educ Ciencia & Tecnol Sao Paulo, BR-15991502 Matao, SP - Brazil

^[4] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522 - Australia

^[5] Univ Oslo, Dept Phys, N-0316 Oslo - Norway

• Tipo de documento: Artigo Científico
• Fonte: IEEE Transactions on Applied Superconductivity; v. 25, n. 3 JUN 2015.
• Citações Web of Science: 8

Resumo

Dendritic flux avalanches triggered by thermomagnetic instabilities in Nb superconducting films have been limited by inclusion of circular holes of different diameters produced by optical lithography. We have observed a compromise between dendrite and hole sizes, for which avalanches are effectively arrested. For holes much smaller than the dendrites, only individual branches are stopped. Large holes are not a good solution, since they change the film geometry. A noteworthy trapping is observed at the holes with diameter between the width of an individual branch and the size of a whole dendrite. The present work shows the trend to optimize stop-holes for limiting thermomagnetic avalanches in superconducting films. (AU)

• Processo FAPESP: 13/16097-3 - Instabilidades termomagnéticas em filmes supercondutores: interação entre avalanches de fluxo e regiões não-supercondutoras criadas intencionalmente
• Beneficiário: Fabiano Colauto
• Modalidade de apoio: Auxílio à Pesquisa - Regular