Spin-dependent transparency of ferromagnet/superconductor interfaces

K. Xia, Paul J. Kelly, G.E.W. Bauer, I. Turek

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Abstract

We combine parameter-free calculations of the transmission and reflection matrices for clean and dirty interfaces with a scattering-theory formulation of Andreev reflection (AR) generalized to spin-polarized systems in order to critically evaluate the use of an extended Blonder-Tinkham-Klapwijk (BTK) model to extract values of the spin polarization for ferromagnetic metals from measurements of point-contact AR. Excellent agreement with the experimental conductance data is found for Pb/Cu but it is less good for Pb/Ni and poor for Pb/Co, indicating that the BTK formalism does not describe transport through superconducting/ferromagnetic interfaces correctly.
Original languageUndefined
Pages (from-to)166603/1-166603/4
Number of pages4
JournalPhysical review letters
Volume89
Issue number16
DOIs
Publication statusPublished - 2002

Keywords

  • IR-43376
  • METIS-206460

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