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Determining the current polarization in Al/Co nanostructured point contacts

F. Pérez-Willard, J. C. Cuevas, C. Sürgers, P. Pfundstein, J. Kopu, M. Eschrig, and H. v. Löhneysen
Phys. Rev. B 69, 140502(R) – Published 5 April 2004
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Abstract

We present a study of the Andreev reflections in superconductor/ferromagnet nanostructured point contacts. The experimental data are analyzed in the frame of a model with two spin-dependent transmission coefficients for the majority and minority charge carriers in the ferromagnet. This model consistently describes the whole set of conductance measurements as a function of voltage, temperature, and magnetic field. The ensemble of our results shows that the degree of spin polarization of the current can be unambiguously determined using Andreev physics.

  • Received 16 January 2004

DOI:https://doi.org/10.1103/PhysRevB.69.140502

©2004 American Physical Society

Authors & Affiliations

F. Pérez-Willard1, J. C. Cuevas2, C. Sürgers1, P. Pfundstein3, J. Kopu2, M. Eschrig2, and H. v. Löhneysen1,4

  • 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 2Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 3Laboratorium für Elektronenmikroskopie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 4Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany

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Issue

Vol. 69, Iss. 14 — 1 April 2004

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