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 .
Torokhtii, K., Pompeo, N., Meneghini, C., C., A., C., C., E. A., I., et al. (2012). Microwave properties of Nb/PdNi/Nb trilayers. Observation of flux flow in excess of Bardeen-Stephen theory. JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 26, 571-574 [10.1007/s10948-012-1795-7].
Microwave properties of Nb/PdNi/Nb trilayers. Observation of flux flow in excess of Bardeen-Stephen theory
TOROKHTII, KOSTIANTYN;POMPEO, NICOLA;MENEGHINI, CARLO;SILVA, Enrico
2012-01-01
Abstract
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 .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
