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We assess the potential of the ferrimagnetic spinel ferrites CoFe2O4 andNiFe2O4 to act as spin filtering barriers in magnetic tunnel junctions. Ourstudy is based on the electronic structure calculated by means offirst-principles density functional theory within different approximations forthe exchange correlation energy. We show that, in agreement with previouscalculations, the densities of states suggest a lower tunneling barrier forminority spin electrons, and thus a negative spin-filter effect. However, amore detailed analysis based on the complex band-structure reveals that bothsigns for the spin-filtering efficiency are possible, depending on the bandalignment between the electrode and the barrier materials and depending on thespecific wave-function symmetry of the relevant bands within the electrode.

Spin-filtering efficiency of ferrimagnetic spinels CoFe2O4 and NiFe2O4