Abstract:
Circularly polarized electroluminescence from GaMnAs/$n^{++}$GaAs/$n$-GaAs/InGaAs/$p$-GaAs heterostructures is studied. A hysteresis-like magnetic field dependence of the degree of circular polarization can be attributed to the injection of spin-polarized electrons from the magnetized GaMnAs layer. This effect is observed in the temperature range 10–90 K.