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;
2012-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
