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The Andreev transport through a quantum dot coupled to two externalferromagnetic leads and one superconducting lead is studied theoretically bymeans of the real-time diagrammatic technique in the sequential and cotunnelingregimes. We show that the tunnel magnetoresistance (TMR) of the Andreev currentdisplays a nontrivial dependence on the bias voltage and the level detuning,and can be described by analytical formulas in the zero temperature limit. Thecotunneling processes lead to a strong modification of the TMR, which is mostvisible in the Coulomb blockade regime. We find a zero-bias anomaly of theAndreev differential conductance in the parallel configuration, which isassociated with a nonequilibrium spin accumulation in the dot triggered byAndreev processes.

Superconducting proximity effect and zero-bias anomaly in transport through quantum dots weakly attached to ferromagnetic leads