Physics of vortex motion by means of microwave surface impedance measurements (Review article)

In this paper we present a short overview on the results that can be obtained through the study of vortex motion at high frequencies. The phenomenological force balance for isolated-like vortices shaken by microwave currents and subjected to viscous drag, pinning forces and thermal creep is recalled...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2020-04, Vol.46 (4), p.343-347
Main Authors: Pompeo, N., Alimenti, A., Torokhtii, K., Silva, E.
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Electrical resistivity
Fluid flow
Flux pinning
Viscosity
Viscous drag
Vortices
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Summary:In this paper we present a short overview on the results that can be obtained through the study of vortex motion at high frequencies. The phenomenological force balance for isolated-like vortices shaken by microwave currents and subjected to viscous drag, pinning forces and thermal creep is recalled and physically presented. The derived vortex motion resistivity, together with the main vortex parameters (viscosity η and flux flow resistivity ρff, pinning constant kp, creep factor χ), is then commented. Sample measurements are reported to illustrate the main aspects of the involved physical models.
ISSN:1063-777X
1090-6517
DOI:10.1063/10.0000865