Spin filtering through Cd1−yMgyTe/Cd1−xMnxTe heterostructure

The spin filtering through Cd1−yMgyTe/Cd1−xMnxTe heterostructure, both with zero and with positive zero-field conduction band offset, is investigated theoretically. The magnetic field dependence of the transmission coefficients, current densities, and spin polarizations for considered systems have been studied. It is found that a positive zero-field conduction band offset as high as 3 meV shifts considerably the onset of the spin-up complete suppression to lower magnetic field region and thereby unity spin polarization initiates at lower magnetic field.