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arxiv: 1210.6974 · v1 · submitted 2012-10-25 · ❄️ cond-mat.supr-con · cond-mat.str-el

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

K. Torokhtii , N. Pompeo , C. Meneghini , C. Attanasio , C. Cirillo , E. A. Ilyina , S. Sarti , E. Silva
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords microwavepdniflowfluxpropertiesthicknesstrilayersapplied
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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 $d_S$=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.

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