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Abstract
Abstract Transmission through a sufficiently thick vacuum barrier is factorized in the product of two “surface transmission functions” and a vacuum decay factor. Based on this factorization, we study the spin polarization of the tunneling current from clean and oxidized (1 1 1) FCC Co surfaces through vacuum into Al. The conductance is calculated using the principal-layer Green's function approach within the tight-binding LMTO scheme. We find that for typical vacuum barrier thicknesses the tunneling current from the clean surface is dominated by minority-spin electrons. A monolayer of oxygen on top of the surface completely changes the shape of k || -resolved transmission and makes the tunneling current almost 100% majority-spin polarized.
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