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. (C) 2011 Elsevier B.V. All rights reserved.
Vortex motion in Nb/PdNi/Nb trilayers: New aspects in the flux flow state / K., Torokhtii; C., Attanasio; C., Cirillo; E. A., Ilyina; N., Pompeo; Sarti, Stefano; E., Silva. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 479:(2012), pp. 140-142. [10.1016/j.physc.2011.12.011]
Vortex motion in Nb/PdNi/Nb trilayers: New aspects in the flux flow state
SARTI, Stefano;
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 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. (C) 2011 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
