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

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  • 14 August 2003
Abstract
Modeling of spin-dependent tunneling from clean and oxidized fcc Co surfaces through vacuum into Al demonstrates the decisive role of bonding between Co and O at the surface. By factorizing the transmission through a sufficiently thick vacuum barrier into the product of two surface transmission functions and a vacuum decay factor we calculate the conductance 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 the majority-spin dominated conductance for the oxidized Co surface.

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