Microwave Properties of Nb/PdNi/Nb Trilayers
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- Torokhtii, K., Pompeo, N., Meneghini, C. et al. J Supercond Nov Magn (2013) 26: 571. doi:10.1007/s10948-012-1795-7
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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 dS=15 nm, and a ferromagnetic PdNi layer of thicknesses dF=1, 2, 8 and 9 nm. We focus on the vortex state. Magnetic fields up to Hc2 were applied. The microwave resistivity at fixed H/Hc2 increases with dF, eventually exceeding the Bardeen–Stephen flux-flow value. Vortex pinning is very weak at large dF.