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We study the dynamics of vortex lines inSupercondutor/Ferromagnet/Superconductor (SFS) heterostructures at microwavefrequencies. We have employed swept-frequency, Corbino-disk and resonant,dielectric-resonator techniques to obtain the field and temperature dependenceof the vortex-state parameters. We concentrate here on the genuine flux-flowresistivity $\rho_{ff}$, that we access at subcritical currents using asufficiently high driving frequency. We find that $\rho_{ff}$ does not followthe well-known Bardeen-Stephen model. Instead, it is well described by a fulltime-dependent Ginzburg-Landau expression at very thin F layer thickness, butchanges to a previously unreported field-dependence when the F layer exceeds afew nm.

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