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

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

2011-12-21

arxiv.org/abs/1112.5077v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

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 $\rho_{ff}$, that we access at subcritical currents using a sufficiently high driving frequency. We find that $\rho_{ff}$ 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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