  Helicity-dependent photocurrent delta-I has been detected successfully under
experimental configuration that a circularly polarized light beam is impinged
with a right angle on a cleaved sidewall of the Fe/x-AlOx/GaAs-based n-i-p
double-heterostructure. The photocurrent delta-I has showed a well-defined
hysteresis loop which resembles that of the magnetization of the in-plane
magnetized Fe layer in the devices. The value of delta-I has been |delta-I|~0.2
nA at 5 K under the remnant magnetization state. Study on temperature
dependence of the relative delta-I value at H = 0 has revealed that it is
maximized at temperatures 125 - 150 K, and is still measurable at room
temperature.
