journal article·2018-08-01Open access

Energy of dendritic avalanches in thin-film superconductors

T. Qureishy, J. I. Vestgården, A. J. Qviller, A. S. Fjellvåg, J. M. Meckbach, A. Torgovkin, T. H. Johansen, K. Ilin, M. Siegel, I. Maasilta, P. Mikheenko

AIP Advances· Volume 8· Issue 8

Abstract

A method for calculating stored magnetic energy in a thin superconducting film based on quantitative magneto-optical imaging is developed. Energy and magnetic moment are determined with these calculations for full hysteresis loops in a thin film of the superconductor NbN. Huge losses in energy are observed when dendritic avalanches occur. Magnetic energy, magnetic moment, sheet current and magnetic flux distributions, all extracted from the same calibrated magneto-optical images, are analyzed and discussed. Dissipated energy and the loss in moment when dendritic avalanches occur are related to each other. Calculating these losses for specific spatially-resolved flux avalanches is a great advantage, because of their unpredictable and non-reproducible nature. The relative losses in energy are much higher than the relative losses in moment.
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Research context

OpenAlex topics: Physics of Superconductivity and Magnetism · Magneto-Optical Properties and Applications · Magnetic Properties and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, University of Oslo 1 , P.O. Box 1048 Blindern, 0316 Oslo, Norway

Norwegian Defence Research Establishment (FFI) 2 , P.O. Box 25, 2027 Kjeller, Norway

nSolution AS 3 , Maries Gate 6, 0368 Oslo, Norway

Department of Chemistry, University of Oslo 4 , P.O. Box 1033 Blindern, 0315 Oslo, Norway

Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology 5 , Hertzstr. 16, 76187 Karlsruhe, Germany

Nanoscience Center, Department of Physics 6 , P.O. Box 35, , FIN-40014 Jyväskylä, Finland

University of Jyväskylä 6 , P.O. Box 35, , FIN-40014 Jyväskylä, Finland

Institute for Superconducting and Electronic Materials, University of Wollongong 7 , Northfields Avenue, Wollongong, NSW 2522, Australia

Funding

Norges Forskningsråd · Academy of Finland

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