1210.6974 (K. Torokhtii et al.)

Microwave properties of Nb/PdNi/Nb trilayers. Observation of flux flow
in excess of Bardeen-Stephen theory    [PDF]

K. Torokhtii, N. Pompeo, C. Meneghini, C. Attanasio, C. Cirillo, E. A. Ilyina, S. Sarti, E. Silva

We combine wideband (1-20 GHz) Corbino disk and dielectric resonator (8.2 GHz) techniques to study the microwave properties in Nb/PdNi/Nb trilayers, grown by UHV dc magnetron sputtering, composed by Nb layers of nominal thickness $d_S$=15 nm, and a ferromagnetic PdNi layer of thickness $d_F$= 1, 2, 8 and 9 nm. We focus on the vortex state. Magnetic fields up to $H_{c2}$ were applied. The microwave resistivity at fixed $H/H_{c2}$ increases with $d_F$, eventually exceeding the Bardeen Stephen flux flow value.

View original: http://arxiv.org/abs/1210.6974