Experimental verification of contact-size estimates in point-contact spectroscopy on superconductor/ferromagnet heterocontacts

J. Gramich, P. Brenner, C. Sürgers, H. v. Löhneysen, and G. Goll
Phys. Rev. B 86, 155402 – Published 2 October 2012

Abstract

Nanostructured superconductor/ferromagnet heterocontacts are studied in the different transport regimes of point-contact spectroscopy. Direct measurements of the nanocontact size by scanning electron microscopy allow a comparison with theoretical models for contact-size estimates of heterocontacts. Our experimental data give evidence that size estimates yield reasonable values for the point-contact diameter d as long as the samples are carefully characterized with respect to the local electronic parameters.

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  • Received 6 June 2012

DOI:https://doi.org/10.1103/PhysRevB.86.155402

©2012 American Physical Society

Authors & Affiliations

J. Gramich1, P. Brenner1, C. Sürgers2, H. v. Löhneysen1,2,3, and G. Goll1,*

  • 1DFG-Center for Functional Nanostructures, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
  • 2Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
  • 3Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany

  • *gernot.goll@kit.edu

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Vol. 86, Iss. 15 — 15 October 2012

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