A method for the switching of the spin polarization of the electric current injected into a semiconductor is proposed, based on injecting spins from a diluted magnetic semiconductor through a ferroelectric tunnel barrier. We show that the reversal of the electric polarization of the ferroelectric results in a sizable change in the spin polarization of the injected current, thereby providing a two-state electrical control of this spintronic device. We also predict a possibility of switching of tunneling magnetoresistance in magnetic tunnel junctions with a ferroelectric barrier and coexistence of tunneling magnetoresistance and giant electroresistance effects in these multiferroic tunnel junctions.
Zhuravlev, Mikhail Y.; Jaswal, Sitaram; Tsymbal, Evgeny Y.; and Sabirianov, Renat F., "Ferroelectric Switch for Spin Injection" (2005). Physics Faculty Publications. 25.