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We consider the non-local quantum transport properties of a graphenesuperconducting spin-valve. It is shown that one may create a spin-switcheffect between perfect elastic co-tunneling (CT) and perfect crossedAndreev-reflection (CAR) for all bias voltages in the low-energy regime byreversing the magnetization direction in one of the ferromagnetic layers. Thisopportunity arises due the possibility of tuning the local Fermi-level ingraphene to values equivalent to a weak, magnetic exchange splitting, thusreducing the Fermi surface for minority spins to a single point and renderinggraphene to be half-metallic. Such an effect is not attainable in aconventional metallic spin-valve setup, where the contributions from CT and CARtend to cancel each other and noise-measurements are necessary to distinguishthese processes.

Crossed Andreev reflection in superconducting graphene spin-valves: Spin-switch effect