Cascade dynamics of thermomagnetic avalanches in superconducting films with holes

Author
Vestgården, Jørn Inge
Colauto, Fabiano
de Andrade, AMH
Oliveira, AAM
Ortiz, W. A.
Johansen, Tom Henning
Date Issued
2015
Permalink
http://publications.ffi.no/handle/123456789/481
DOI
10.1103/PhysRevB.92.144510
Collection
Articles
Description
Vestgården, Jørn Inge; Colauto, Fabiano; de Andrade, AMH; Oliveira, AAM; Ortiz, W. A.; Johansen, Tom Henning. Cascade dynamics of thermomagnetic avalanches in superconducting films with holes. Physical Review B. Condensed Matter and Materials Physics 2015 ;Volum 92.(14) s. -
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Abstract
The submicrosecond dynamics of thermomagnetic avalanches in superconducting films with nonconducting holes (antidots) is considered. When such an avalanche reaches a hole, it is quickly filled with magnetic flux, and often its rim becomes unstable and a second avalanche is nucleated. In this work the time- and space-resolved behavior of such cascading avalanche behavior is determined using numerical simulations. Results are presented for films with holes of different shape. It is found that holes with sharp corners are those that most frequently create secondary avalanches, and they tend to nucleate in corners. Magneto-optical imaging of Nb films patterned with the same set of holes strongly supports the numerical results.
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