4.8 Article

Spin-dependent transparency of ferromagnet/superconductor interfaces

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PHYSICAL REVIEW LETTERS
卷 89, 期 16, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.89.166603

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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.

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