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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)

KFM 15.6: Talk

Wednesday, March 20, 2024, 16:15–16:30, EB 407

Electric field induced reversal of spin alignment in graphone/hexagonal boron nitride on Ni(111) — Jaime Oliveira da Silva and •Fernando Nogueira — CFisUC, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, Portugal

Spintronic applications require a precise and efficient way of manipulating the material's magnetisation. This work demonstrates that it is possible to revert the surface magnetisation of a graphene sheet covered in half by hydrogen by applying an external electric field. To demonstrate this possibility, we study a prototypical material where this effect occurs: a 2D layer material formed by a Ni(111) substrate, an hBN monolayer and a graphone sheet. Screening of the Coulomb interactions between the ferromagnetic surface and the graphone layer plays a key role int the magnetisation reversal, enabling graphone to partially recover its isolated magnetisation value. The screening is due to the forming of an ionic bond between the N and B atoms in the hBN sheet. As the proposed material has a flat band at the Fermi level, our work also provides prospects for investigating flat-band instabilities.

Keywords: magnetoelectric; 2D material; flat band; density functional theory