Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 16: 2D materials: Graphene and BN (joint session HL/DS)

DS 16.1: Talk

Tuesday, March 13, 2018, 14:00–14:15, A 151

Field-effect proximity exchange coupling in bilayer graphene on ferromagnetic insulator — •Klaus Zollner, Martin Gmitra, and Jaroslav Fabian — Institute for Theoretical Physics, Regensburg, Germany

Graphene can be made magnetic by proximity effect through ferromagnetic substrates. We show, by realistic first-principles calculations, that bilayer graphene on Cr₂X₂Te₆, a family of ferromagnetic insulators that can be exfoliated in single layers (X = Si and Ge), experiences a layer dependent proximity exchange effect [1]. Due to short range of this proximity effect and the intrinsic layer dependent formation of low energy bands in bilayer graphene, only the valence band gets spin split. In addition, we apply realistic electric fields across the heterostructure, to tune the potential energy of the bilayers and find that we can switch electron and hole bands, along with the exchange splitting. With that we predict fully electrically tunable magnetism for transport carriers, which opens a vast field of proximity spintronics.

This work was supported by DFG SPP 1666, SFB 689, SFB 1277, and by the European Unions Horizon 2020 research and innovation programme under Grant agreement No. 696656.

[1] K. Zollner, M. Gmitra, and J. Fabian, arXiv:1710.08117 (2017).