The superconducting and structural properties of S/F/S (Superconductor/Ferromagnet/Superconductor) heterostructures have been studied by means of microwave measurements (1–20 GHz) and x-ray absorption fine structure (XAFS) spectroscopy. Nb/PdNi/Nb trilayers have been studied as a function of F layer thickness. With respect to pure Nb, XAFS analysis shows that the heterostructures exhibit larger structural disorder in the S layers. Microwave measurements show evidence for a progressively weaker vortex pinning with increasing F thickness. However, no clear correlation is found with the local disorder in Nb: the weakest pinning is not in the most disordered trilayer. Therefore, the structural disorder in the superconducting material cannot explain on its own the changes in vortex pinning. We argue that the F layer acts on the superconducting state itself. We propose possible explanations for the observed behavior.

Pompeo, N., Torokhtii, K., Meneghini, C., Mobilio, S., Loria, R., Cirillo, C., et al. (2013). Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers. JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 26, 1-5 [10.1007/s10948-012-2057-4].

Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers

POMPEO, NICOLA;TOROKHTII, KOSTIANTYN;MENEGHINI, CARLO;MOBILIO, Settimio;LORIA, RITA;SILVA, Enrico
2013

Abstract

The superconducting and structural properties of S/F/S (Superconductor/Ferromagnet/Superconductor) heterostructures have been studied by means of microwave measurements (1–20 GHz) and x-ray absorption fine structure (XAFS) spectroscopy. Nb/PdNi/Nb trilayers have been studied as a function of F layer thickness. With respect to pure Nb, XAFS analysis shows that the heterostructures exhibit larger structural disorder in the S layers. Microwave measurements show evidence for a progressively weaker vortex pinning with increasing F thickness. However, no clear correlation is found with the local disorder in Nb: the weakest pinning is not in the most disordered trilayer. Therefore, the structural disorder in the superconducting material cannot explain on its own the changes in vortex pinning. We argue that the F layer acts on the superconducting state itself. We propose possible explanations for the observed behavior.
Pompeo, N., Torokhtii, K., Meneghini, C., Mobilio, S., Loria, R., Cirillo, C., et al. (2013). Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers. JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 26, 1-5 [10.1007/s10948-012-2057-4].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/138611
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 13
social impact