Spin-dependent transparency of ferromagnet/superconductor interfaces

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

doi:10.1103/PhysRevLett.89.166603

Spin-dependent transparency of ferromagnet/superconductor interfaces

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

Research output: Contribution to journal › Article › Academic › peer-review

67 Citations (Scopus)

207 Downloads (Pure)

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 language	Undefined
Pages (from-to)	166603/1-166603/4
Number of pages	4
Journal	Physical review letters
Volume	89
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.89.166603
Publication status	Published - 2002

Keywords

IR-43376
METIS-206460

Access to Document

10.1103/PhysRevLett.89.166603

spin-dependent

Cite this

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AU - Xia, K.

AU - Kelly, Paul J.

AU - Bauer, G.E.W.

AU - Turek, I.

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

KW - IR-43376

KW - METIS-206460

U2 - 10.1103/PhysRevLett.89.166603

DO - 10.1103/PhysRevLett.89.166603

M3 - Article

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