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The electric current and the magnetoresistance effect are studied in a doublequantum-dot system, where one of the dots QDa is coupled to two ferromagneticelectrodes (F1,F2), while the second QDb is connected to a superconductor S.For energy scales within the superconductor gap, electric conduction is allowedby Andreev reflection processes. Due to the presence of two ferromagneticleads, non-local crossed Andreev reflections are possible. We found that themagnetoresistance sign can be changed by tuning the external potential appliedto the ferromagnets. In addition, it is possible to control the current of thefirst ferromagnet (F1) through the potential applied to the second one (F2). Wehave also included intradot interaction and gate voltages at each quantum dotand analyzed their influence through a mean field approximation. Theinteraction reduces the current amplitudes with respect to the non-interactingcase, but the switching effect still remains as a manifestation of quantumcoherence, in scales of the order of the superconductor coherence length.

Magnetoresistance and transistor-like behavior of double quantum dots connected to ferromagnetic and superconductor leads