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Applied Physics Letters / Volume 97 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 97, 092504 (2010); http://dx.doi.org/10.1063/1.3479529 (3 pages)

Strong critical current density enhancement in NiCu/NbN superconducting nanostripes for optical detection

N. Marrocco1, G. P. Pepe1, A. Capretti1, L. Parlato1, V. Pagliarulo1, G. Peluso1, A. Barone1, R. Cristiano2, M. Ejrnaes2, A. Casaburi2, N. Kashiwazaki3, T. Taino3, H. Myoren3, and Roman Sobolewski4

1Department of Physical Sciences and CNR-SPIN, Faculty of Engineering, University of Naples Federico II, 80100 Naples, Italy
2CNR Istituto di Cibernetica “E. Caianiello,” 80078 Pozzuoli, Italy
3Graduate School of Science and Engineering, Saitama University, 338–8570 Saitama, Japan
4Departments of Electrical and Computer Engineering and Physics and Astronomy, Materials Science Program, and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231, USA

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(Received 4 June 2010; accepted 16 July 2010; published online 31 August 2010)

We present measurements of ferromagnet/superconductor (NiCu/NbN) and plain superconducting (NbN) nanostripes with the linewidth ranging from 150 to 300 nm. The NiCu (3 nm)/NbN (8 nm) bilayers, as compared to NbN (8 nm), showed a up to six times increase in their critical current density, reaching at 4.2 K the values of 5.5 MA/cm2 for a 150 nm wide nanostripe meander and 12.1 MA/cm2 for a 300 nm one. We also observed six-time sensitivity enhancement when the 150 nm wide NiCu/NbN nanostripe was used as an optical detector. The strong critical current enhancement is explained by the vortex pinning strength and density increase in NiCu/NbN bilayers and confirmed by approximately tenfold increase in the vortex polarizability factor.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

copper alloys, critical current density (superconductivity), ferromagnetic materials, flux pinning, nanostructured materials, nickel alloys, niobium compounds, optical sensors, superconducting thin films, type II superconductors

PACS

  • 74.78.Na

    Mesoscopic and nanoscale systems

  • 74.25.Wx

    Vortex pinning (includes mechanisms and flux creep)

  • 74.25.Sv

    Critical currents

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3479529

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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