Reversal of spin polarization in Fe/GaAs (001) driven by resonant surface states: First-principles calculations

Details Reversal of spin polarization in Fe/GaAs (001) driven by resonant surface states: First-principles calculations Reversal of spin polarization in Fe/GaAs (001) driven by resonant surface states: First-principles calculations

2007-07-24

arxiv.org/abs/0707.3644v1

Phys. Rev. Lett. 99, 196603 (2007)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.99.196603

A minority-spin resonant state at the Fe/GaAs(001) interface is predicted to reverse the spin polarization with voltage bias of electrons transmitted across this interface. Using a Green's function approach within the local spin density approximation we calculate spin-dependent current in a Fe/GaAs/Cu tunnel junction as a function of applied bias voltage. We find a change in sign of the spin polarization of tunneling electrons with bias voltage due to the interface minority-spin resonance. This result explains recent experimental data on spin injection in Fe/GaAs contacts and on tunneling magnetoresistance in Fe/GaAs/Fe magnetic tunnel junctions.

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