High-velocity instabilities in the vortex lattice of Nb/permalloy bilayers (Articolo in rivista)

Type
Label
  • High-velocity instabilities in the vortex lattice of Nb/permalloy bilayers (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.76.054502 (literal)
Alternative label
  • Armenio, AA; Bell, C; Aarts, J; Attanasio, C (2007)
    High-velocity instabilities in the vortex lattice of Nb/permalloy bilayers
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Armenio, AA; Bell, C; Aarts, J; Attanasio, C (literal)
Pagina inizio
  • 0545021 (literal)
Pagina fine
  • 0545026 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 6 (literal)
Note
  • Scopus (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Salerno, Lab Reg SuperMat, CNR, INFM, I-84081 Baronissi, Italy; Univ Salerno, Dipartmento Fis, I-84081 Baronissi, Italy; Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands (literal)
Titolo
  • High-velocity instabilities in the vortex lattice of Nb/permalloy bilayers (literal)
Abstract
  • We have studied the critical current density J(c) for onset of vortex motion and the dynamic instability of the moving vortex lattice at high driving currents in superconducting (S)/ferromagnetic (F) Nb/Ni0.80Fe0.20 bilayers and in a single Nb film with the same thickness. The samples are all characterized by relatively high values of the pinning strength. The measured current-voltage characteristics are successfully described in the framework of the Larkin-Ovchinnikov model, modified in order to take into account the effect of the pinning close to the instability. We find that J(c) is smaller in the S/F bilayers than in the single film and argue that this is due to the strongly inhomogeneous order parameter in the bilayers. Also, the critical velocity v(*) for the occurrence of the instability is found to be significantly larger in the S/F bilayers than in the single S layer. By extracting the quasiparticle energy relaxation rate from v(*), we show that this effect is due to the same inhomogeneous order parameter and the resulting lower average value of the superconducting gap. (literal)
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