Spin transmission across Ni Fe

/GaAs Schottky barrier interfaces was investigated at room temperature. Circularly polarized light was used to excite electrons with a spin polarization perpendicular to the "lm plane. An almost constant di!erence in the helicity-dependent photocurrent was observed at negative bias, attributed to e$cient spin "ltering at the interface. The photon energy dependence indicates that the asymmetry in the photocurrent vanishes at high en