Energy of dendritic avalanches in thin-film superconductors | Zendy

T. Qureishy | Zendy; J. I. Vestgården | Zendy; A. J. Qviller | Zendy; Asbjørn Slagtern Fjellvåg | Zendy; J. M. Meckbach | Zendy; Andrii Torgovkin | Zendy; T. H. Johansen | Zendy; K. Ilin | Zendy; M. Siegel | Zendy; I. J. Maasilta | Zendy; P. Mikheenko | Zendy

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Energy of dendritic avalanches in thin-film superconductors

Author(s) -

T. Qureishy,

J. I. Vestgården,

A. J. Qviller,

Asbjørn Slagtern Fjellvåg,

J. M. Meckbach,

Andrii Torgovkin,

T. H. Johansen,

K. Ilin,

M. Siegel,

I. J. Maasilta,

P. Mikheenko

Publication year - 2018

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5045682

Subject(s) - superconductivity , magnetic moment , moment (physics) , magnetic energy , hysteresis , condensed matter physics , thin film , magnetic flux , energy (signal processing) , flux (metallurgy) , materials science , magnetic hysteresis , magnetic field , physics , magnetization , nanotechnology , classical mechanics , quantum mechanics , metallurgy

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.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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