Spin-polarized hole transport through a diluted magnetic semiconductor heterostructure with magnetic-field modulations

We investigate the spin-polarized transport of holes in symmetric and asymmetric diluted magnetic semiconductor heterostructures of CdTe/Cd1-xMnxTe under local magnetic field modulations. The effect of a type- I - to - type-II transition in the CdTe/Cd1-xMnxTe heterostructure is also used in our model. The spatially modulated magnetic field provides us with a new degree of freedom to control the degree of spin-polarized transport of holes. Our investigations show that spin-polarized transport of holes reaches 100% polarization with modulated weak magnetic field. This could be suitably engineered in the fabrication of perfect magnetic semiconductor spin-filters.