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Applied Physics Letters / Volume 96 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 092512 (2010); http://dx.doi.org/10.1063/1.3350681 (3 pages)

Suppression of flux avalanches in superconducting films by electromagnetic braking

F. Colauto1, E. Choi2, J. Y. Lee2, S. I. Lee3, E. J. Patiño4,5, M. G. Blamire5, T. H. Johansen6, and W. A. Ortiz1

1Departamento de Física, Universidade Federal de São Carlos, São Carlos, 13565-905 São Paulo, Brazil
2Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
3National Creative Research Initiative Center for Superconductivity and Department of Physics, Sogang University, Seoul 121-742, Republic of Korea
4Departamento de Física, Universidad de los Andes, Bogota, DC, Colombia
5Department of Materials Science, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom
6Department of Physics, University of Oslo, POB 1048, Blindern, 0316 Oslo, Norway

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(Received 9 February 2010; accepted 10 February 2010; published online 4 March 2010)

Magnetic fields perpendicular to superconducting films often trigger vortex avalanches, which always are very harmful for electronic devices and other applications. Such avalanches can be suppressed by a metal layer placed in contact with the superconductor surface, an effect that up to now has been thought to be a consequence of improved heat conduction. Here we show experimentally that the role of the metal layer is not that of a heat-sink, but rather that of an electromagnetic drag due to eddy currents induced in the metal layer during the abrupt onset of the flux avalanches. The effect is demonstrated for films of MgB2 and Nb.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

eddy currents, flux flow, magnesium compounds, niobium, superconducting thin films, type II superconductors

PACS

  • 74.25.Wx

    Vortex pinning (includes mechanisms and flux creep)

  • 74.78.-w

    Superconducting films and low-dimensional structures

  • 74.70.Ad

    Metals; alloys and binary compounds (including A15, MgB2, etc.)

  • 74.25.Ha

    Magnetic properties including vortex structures and related phenomena

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3350681

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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