an efficient spin polarizer in nonmagnetic semiconductors is provided . previous spin injection devices suffered from very low efficiency into semiconductors . an efficient spin polarizer is provided which is based on ferromagnetic - semiconductor heterostructures and ensures spin polarization of electrons in nonmagnetic semiconductors close to 100 % near the ferromagnetic - semiconductor junctions at wide temperature intervals ranging from very low temperatures to room temperatures even in the case when spin polarization of electrons in the ferromagnetic layer is relatively low .