Microwave Properties of Nb/PdNi/Nb Trilayers

• Published in: Journal of superconductivity and novel magnetism Vol. 26; no. 3; pp. 571 - 574
• Main Authors: Torokhtii, K, Pompeo, N, Meneghini, C, Attanasio, C, Cirillo, C, Ilyina, E A, Sarti, S, Silva, E
• Format: Journal Article
• Language: English
• Published: 01-03-2013
• Subjects: Electrical resistivity; Fluid flow; Magnetic fields; Microwaves; Niobium; Superconductivity; Vortices; Wideband
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-012-1795-7

We combine wideband (1a20 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 BardeenaStephen flux-flow value. Vortex pinning is very weak at large d F .