Recent studies indicated that under zero bias there is no spin polarization in an antiparallel magnetic-electric barrier structure, where double δ-function magnetic fields point in the opposite direction. Our research demonstrates that an external electric field can make such a hybrid structure spin polarized, however, the degree of spin polarization is smaller than 5% for the GaAs system. It is also shown that the electric barrier can greatly suppress the current density and affect the degree of spin polarization. The results can be explained by the variation of the effective potential induced by the electric field.
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Wang et al. (2002) studied this question.
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