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 ρff, that we access at subcritical currents using a sufficiently high driving frequency. We find that ρff 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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