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We analyze charge transport through a ballisticferromagnet/insulator/superconductor junction by means of the Bogoliubov-deGennes equations. We take into account the possibility that ferromagnetism inthe first electrode may be driven by a mass renormalization of oppositelypolarized carriers, i.e. by a spin bandwidth asymmetry, rather than by a rigidsplitting of up-and down-spin electron bands as in a standard Stonerferromagnet. By evaluating the averaged charge conductance for both an s- and a$d_{x^2-y^2}$-wave order parameter for the S side, we show that the massmismatch in the ferromagnetic electrode may mimic a spin active barrier.Indeed, in the $s$-wave case we show that under suitable conditions the spindependent conductance of minority carriers below the energy gap $\Delta_0$ canbe larger than for majority carriers, and lower above $\Delta_0$. On the otherhand, for a d_{x^2-y^2}-wave superconductor similar spin-dependent effects giverise to an asymmetric peak splitting in the conductance. These results suggestthat the junction may work as a spin-filtering device.

Does a ferromagnet with spin-dependent masses produce a spin-filtering effect in a ferromagnetic/insulator/superconductor junction?