Proximity effect in NiCu-based Josephson tunnel junctions

R. Latempa; L. Parlato; G. Peluso; G.P Pepe; A. Ruotolo; A. Barone; Alexandre Avraamovitch Golubov

doi:10.1109/TASC.2005.849713

Proximity effect in NiCu-based Josephson tunnel junctions

R. Latempa, L. Parlato, G. Peluso, G.P Pepe, A. Ruotolo, A. Barone, Alexandre Avraamovitch Golubov

Faculty of Science and Technology

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Abstract

We present experimental results concerning both the fabrication and the characterization of superconducting tunnel junctions based on Nb/NiCu superconductor/ferromagnet (S/F) bilayers. Josephson junctions have been characterized down to T=1.4 K in terms of current-voltage I-V characteristics, Josephson critical current vs magnetic field, role of external magnetic field. Proximity parameters of the bilayer, such as the coherence length and the exchange field energy of the F metal, have been estimated by means of a numerical deconvolution of the I-V data the electronic density of states on both sides of the S/F bilayer. Results have been compared with theoretical predictions from a proximity model for S/F bilayers in the dirty limit in the framework of Usadel equations for the S and F layer, respectively.

Original language	Undefined
Pages (from-to)	133-136
Journal	IEEE transactions on applied superconductivity
Volume	15
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2005.849713
Publication status	Published - 2005

Keywords

METIS-225025
IR-98004

Access to Document

10.1109/TASC.2005.849713

Cite this

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title = "Proximity effect in NiCu-based Josephson tunnel junctions",

abstract = "We present experimental results concerning both the fabrication and the characterization of superconducting tunnel junctions based on Nb/NiCu superconductor/ferromagnet (S/F) bilayers. Josephson junctions have been characterized down to T=1.4 K in terms of current-voltage I-V characteristics, Josephson critical current vs magnetic field, role of external magnetic field. Proximity parameters of the bilayer, such as the coherence length and the exchange field energy of the F metal, have been estimated by means of a numerical deconvolution of the I-V data the electronic density of states on both sides of the S/F bilayer. Results have been compared with theoretical predictions from a proximity model for S/F bilayers in the dirty limit in the framework of Usadel equations for the S and F layer, respectively.",

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T1 - Proximity effect in NiCu-based Josephson tunnel junctions

AU - Latempa, R.

AU - Parlato, L.

AU - Peluso, G.

AU - Pepe, G.P

AU - Ruotolo, A.

AU - Barone, A.

AU - Golubov, Alexandre Avraamovitch

PY - 2005

Y1 - 2005

N2 - We present experimental results concerning both the fabrication and the characterization of superconducting tunnel junctions based on Nb/NiCu superconductor/ferromagnet (S/F) bilayers. Josephson junctions have been characterized down to T=1.4 K in terms of current-voltage I-V characteristics, Josephson critical current vs magnetic field, role of external magnetic field. Proximity parameters of the bilayer, such as the coherence length and the exchange field energy of the F metal, have been estimated by means of a numerical deconvolution of the I-V data the electronic density of states on both sides of the S/F bilayer. Results have been compared with theoretical predictions from a proximity model for S/F bilayers in the dirty limit in the framework of Usadel equations for the S and F layer, respectively.

AB - We present experimental results concerning both the fabrication and the characterization of superconducting tunnel junctions based on Nb/NiCu superconductor/ferromagnet (S/F) bilayers. Josephson junctions have been characterized down to T=1.4 K in terms of current-voltage I-V characteristics, Josephson critical current vs magnetic field, role of external magnetic field. Proximity parameters of the bilayer, such as the coherence length and the exchange field energy of the F metal, have been estimated by means of a numerical deconvolution of the I-V data the electronic density of states on both sides of the S/F bilayer. Results have been compared with theoretical predictions from a proximity model for S/F bilayers in the dirty limit in the framework of Usadel equations for the S and F layer, respectively.

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KW - IR-98004

U2 - 10.1109/TASC.2005.849713

DO - 10.1109/TASC.2005.849713

M3 - Article

SN - 1051-8223

VL - 15

SP - 133

EP - 136

JO - IEEE transactions on applied superconductivity

JF - IEEE transactions on applied superconductivity

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