Effect of interface bonding on spin-dependent tunneling from the oxidized Co surface

Details Effect of interface bonding on spin-dependent tunneling from the oxidized Co surface Effect of interface bonding on spin-dependent tunneling from the oxidized Co surface

2003-08-14

arxiv.org/abs/cond-mat/0308268v2

Phys. Rev. B 69, 174408 (2004).

Physics

Condensed Matter

7 pages, revtex4, 4 embedded eps figures

Scientific paper

10.1103/PhysRevB.69.174408

We demonstrate that the factorization of the tunneling transmission into the product of two surface transmission functions and a vacuum decay factor allows one to generalize Julliere's formula and explain the meaning of the ``tunneling density of states'' in some limiting cases. Using this factorization we calculate spin-dependent tunneling from clean and oxidized fcc Co surfaces through vacuum into Al using the principal-layer Green's function approach. We demonstrate that a monolayer of oxygen on the Co (111) surface creates a spin-filter effect due to the Co-O bonding which produces an additional tunneling barrier in the minority-spin channel. This changes the minority-spin dominated conductance for the clean Co surface into a majority spin dominated conductance for the oxidized Co surface.

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