Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: 2D Materials: Session II (joint session DS/CPP/HL)

DS 12.2: Talk

Tuesday, March 13, 2018, 09:45–10:00, H 2032

Interplay of magnetization between graphene and magnetoelectric multiferroics — •Zeila Zanolli — RWTH Aachen Uiniversity, Aachen, Germany

Graphene and magnetoelectric multiferroics are promising materials for spintronic devices with high performance and low energy consumption. We combine the features of both materials by investigating from first principles the interface between graphene and BaMnO₃, a magnetoelectric multiferroic. We show [1] that the hybrid systems behaves as a spin filter. Electron charge is transferred across the interface and magnetization is induced in the graphene sheet due to the strong interaction between C and Mn. A remarkably large proximity induced spin splitting of the Dirac cones (300 meV) is achieved and doping can make the high-mobility region of the electronic bands experimentally accessible.

Going further, we investigate spin dynamics at finite temperature using a Monte Carlo approach with exchange coupling parameters fitted from first principles. We find that graphene strongly affects the magnetic properties of the substrate, beyond the interface layer, and induces a softening of the Mn magnetization.

Spin Orbit Coupling calculations reveal that the influence of graphene on the substrate is even more radical and is able to change the direction of the easy axis with respect to the bare BaMnO₃ surface. We predict a Rashba splitting of the electronic bands near the K point, and the presence of a Quantum Anomalous Hall effect.

[1] Z. Zanolli, Sci. Rep., 6 (2016) 31346