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We investigate magnetotransport in a ferromagnetic/normal/ferromagneticgraphene junction where a gate electrode is attached to the normal segment. Itis shown that the charge conductance can be maximal at an antiparallelconfiguration of the magnetizations. Moreover, we demonstrate that both themagnitude and the sign of the spin-transfer torque can be controlled by meansof the gate voltage in the normal segment. In this way, the present systemconstitutes a spin-transfer torque transistor. These anomalous phenomena areattributed to the combined effect of the exchange field and the Diracdispersion of graphene. Our prediction opens up the possibility of movingdomain walls parallel or antiparallel to the current in a controllable fashionby means of a local gate voltage.

Anomalous magnetic transport in ferromagnetic graphene junctions