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Applied Physics Letters / Volume 89 / Issue 12 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 89, 122511 (2006); http://dx.doi.org/10.1063/1.2356104 (3 pages)

High quality ferromagnetic 0 and π Josephson tunnel junctions

M. Weides1, M. Kemmler2, E. Goldobin2, D. Koelle2, R. Kleiner2, H. Kohlstedt3, and A. Buzdin4

1Center of Nanoelectronic Systems for Information Technology (CNI), Research Centre Jülich, D-52425 Jülich, Germany
2Physikalisches Institut—Experimentalphysik II, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
3Center of Nanoelectronic Systems for Information Technology (CNI), Research Centre Jülich, D-52425 Jülich, Germany; Department of Material Science and Engineering and University of Berkeley, California 94720; and Department of Physics, University of Berkeley, California 94720
4Institut Universitaire de France, 75005 Paris, France and Condensed Matter Theory Group, CPMOH, University Bordeaux 1, UMR 5798, CNRS, F-33405 Talence Cedex, France

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(Received 12 April 2006; accepted 1 August 2006; published online 19 September 2006)

The authors fabricated high quality Nb/Al2O3/Ni0.6Cu0.4/Nb superconductor-insulatorferromagnet-superconductor Josephson tunnel junctions. Depending on the thickness of the ferromagnetic Ni0.6Cu0.4 layer and on the ambient temperature, the junctions were in the 0 or π ground state. All junctions have homogeneous interfaces showing almost perfect Fraunhofer patterns. The Al2O3 tunnel barrier allows one to achieve rather low damping, which is desired for many experiments especially in the quantum domain. The McCumber parameter βc increases exponentially with decreasing temperature and reaches βc ≈ 700 at T = 2.11 K. The critical current density in the π state was up to 5 A/cm2 at T = 2.11 K, resulting in a Josephson penetration depth λJ as low as 160 μm. Experimentally determined junction parameters are well described by theory taking into account spin-flip scattering in the Ni0.6Cu0.4 layer and different transparencies of the interfaces.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

niobium, alumina, nickel alloys, copper alloys, type II superconductors, insulating materials, ferromagnetic materials, metallic thin films, magnetic thin films, Josephson effect, ground states, critical current density (superconductivity), penetration depth (superconductivity)

PACS

  • 74.50.+r

    Tunneling phenomena; Josephson effects

  • 74.70.Ad

    Metals; alloys and binary compounds (including A15, MgB2, etc.)

  • 74.25.F-

    Transport properties

  • 74.25.Ha

    Magnetic properties including vortex structures and related phenomena

  • 75.50.Cc

    Other ferromagnetic metals and alloys

  • 74.25.Sv

    Critical currents

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2356104

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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