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.

Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers / N., Pompeo; K., Torokhtii; C., Meneghini; S., Mobilio; R., Loria; C., Cirillo; E. A., Ilyina; C., Attanasio; Sarti, Stefano; E., Silva. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 26:5(2013), pp. 1939-1943. [10.1007/s10948-012-2057-4]

Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers

SARTI, Stefano;
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.
2013
superconductor/ferromagnet heterostructures; vortex pinning; local structure
01 Pubblicazione su rivista::01a Articolo in rivista
Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers / N., Pompeo; K., Torokhtii; C., Meneghini; S., Mobilio; R., Loria; C., Cirillo; E. A., Ilyina; C., Attanasio; Sarti, Stefano; E., Silva. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 26:5(2013), pp. 1939-1943. [10.1007/s10948-012-2057-4]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/506877
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