Articolo in rivista, 2013, ENG, 10.1007/s10948-012-1795-7

Microwave properties of Nb/PdNi/Nb trilayers: Observation of flux flow in excess of bardeen-stephen theory

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

a Dipartimento di Fisica E. Amaldi, CNISM, Università Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy b CNR-SPIN, Dipartimento di Fisica E. Caianiello, Università Degli Studi di Salerno, 84084 Fisciano SA, Italy c Dipartimento di Fisica, Università la Sapienza, 00185 Roma, Italy

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 thicknesses 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. Vortex pinning is very weak at large d F . © 2012 Springer Science+Business Media New York.

Journal of superconductivity and novel magnetism 26 (3), pp. 571–574

Keywords

Corbino disk, Dielectric resonator, Nb, S/F hybrids, Vortex dynamics

CNR authors

Attanasio Carmine, Cirillo Carla

CNR institutes

SPIN – Istituto superconduttori, materiali innovativi e dispositivi