Original Paper

Journal of Superconductivity and Novel Magnetism

, Volume 26, Issue 3, pp 571-574

First online:

Microwave Properties of Nb/PdNi/Nb Trilayers

Observation of Flux Flow in Excess of Bardeen–Stephen Theory
  • K. TorokhtiiAffiliated withDipartimento di Fisica “E. Amaldi” and CNISM, Università Roma Tre
  • , N. PompeoAffiliated withDipartimento di Fisica “E. Amaldi” and CNISM, Università Roma Tre
  • , C. MeneghiniAffiliated withDipartimento di Fisica “E. Amaldi” and CNISM, Università Roma Tre
  • , C. AttanasioAffiliated withCNR-SPIN and Dipartimento di Fisica “E. Caianiello”, Università degli Studi di Salerno
  • , C. CirilloAffiliated withCNR-SPIN and Dipartimento di Fisica “E. Caianiello”, Università degli Studi di Salerno
  • , E. A. IlyinaAffiliated withCNR-SPIN and Dipartimento di Fisica “E. Caianiello”, Università degli Studi di Salerno
  • , S. SartiAffiliated withDipartimento di Fisica, Università “La Sapienza”
  • , E. SilvaAffiliated withDipartimento di Fisica “E. Amaldi” and CNISM, Università Roma Tre Email author 

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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 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 .

Keywords

Nb S/F hybrids Vortex dynamics Dielectric resonator Corbino disk