We study the dynamics of vortex lines in Supercondutor/Ferromagnet/Superconductor (SFS) heterostructures at microwave frequencies. We have employed swept-frequency, Corbino-disk and resonant, dielectric- resonator techniques to obtain the field and temperature dependence of the vortex-state parameters. We concentrate here on the genuine flux-flow resistivity qff, that we access at subcritical currents using a sufficiently high driving frequency. We find that qff does not follow the well-known Bardeen–Stephen model. Instead, it is well described by a full time-dependent Ginzburg–Landau expression at very thin F layer thickness, but changes to a previously unreported field-dependence when the F layer exceeds a few nm.

Vortex motion in Nb/PdNi/Nb trilayers: New aspects in the flux flow state

ATTANASIO, Carmine;CIRILLO, CARLA;
2012

Abstract

We study the dynamics of vortex lines in Supercondutor/Ferromagnet/Superconductor (SFS) heterostructures at microwave frequencies. We have employed swept-frequency, Corbino-disk and resonant, dielectric- resonator techniques to obtain the field and temperature dependence of the vortex-state parameters. We concentrate here on the genuine flux-flow resistivity qff, that we access at subcritical currents using a sufficiently high driving frequency. We find that qff does not follow the well-known Bardeen–Stephen model. Instead, it is well described by a full time-dependent Ginzburg–Landau expression at very thin F layer thickness, but changes to a previously unreported field-dependence when the F layer exceeds a few nm.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3863945
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