Anomalous magnetic transport in ferromagnetic graphene junctions

Abstract

We investigate magnetotransport in a ferromagnetic/normal/ferromagnetic graphene junction where a gate electrode is attached to the normal segment. It is shown that the charge conductance can be maximal at an antiparallel configuration of the magnetizations. Moreover, we demonstrate that both the magnitude and the sign of the spin-transfer torque can be controlled by means of the gate voltage in the normal segment. In this way, the present system constitutes a spin-transfer torque transistor. These anomalous phenomena are attributed to the combined effect of the exchange field and the Dirac dispersion of graphene. Our prediction opens up the possibility of moving domain walls parallel or antiparallel to the current in a controllable fashion by means of a local gate voltage.

4 pages, 4 figures

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• Reflectionless Transport of Surface Dirac Fermions on Topological Insulators with Induced Ferromagnetic Domain Walls
• Giant magnetoresistance and anomalous transport in phosphorene-based multilayers with noncollinear magnetization
• Gate voltage controlled electronic transport through a ferromagnet/normal/ferromagnet junction on the surface of a topological insulator
• Effect of the attachment of ferromagnetic contacts on the conductivity and giant magnetoresistance of graphene nanoribbons
• Magneto-Transport Properties of Exfoliated Graphene on GaAs
• Integrating MBE materials with graphene to induce novel spin-based phenomena
• Spin Transport and Spin Pump in Graphene-like Materials: Effect of tilt in Dirac cones
• Anisotropic quantum transport in monolayer graphene in the presence of Rashba spin-orbit coupling
• Tunneling magnetoresistance and spin-valley polarization of aperiodic magnetic silicene superlattices
• Weak de-localization in graphene on a ferromagnetic insulating film
• Edge proximity-induced magnetoresistance and spin polarization in ferromagnetic gated bilayer graphene nanoribbon
• Resonance spin transfer torque in ferromagnetic/normal/ferromagnetic spin-valve structure of topological insulators
• Gate-Tunable Spin Transport and Giant Electroresistance in Ferromagnetic Graphene Vertical Heterostructures