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
Original Paper

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.

Keywords

Nb S/F hybrids Vortex dynamics Dielectric resonator Corbino disk 

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • K. Torokhtii
    • 1
  • N. Pompeo
    • 1
  • C. Meneghini
    • 1
  • C. Attanasio
    • 2
  • C. Cirillo
    • 2
  • E. A. Ilyina
    • 2
  • S. Sarti
    • 3
  • E. Silva
    • 1
  1. 1.Dipartimento di Fisica “E. Amaldi” and CNISMUniversità Roma TreRomaItaly
  2. 2.CNR-SPIN and Dipartimento di Fisica “E. Caianiello”Università degli Studi di SalernoFiscianoItaly
  3. 3.Dipartimento di FisicaUniversità “La Sapienza”RomaItaly

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