Sublattice Ferrimagnetism in Quasifreestanding Graphene
А. Г. Рыбкин, А. В. Тарасов, А. А. Рыбкина, Dmitry Yu. Usachov, A. Petukhov, A. V. Eryzhenkov, Д. А. Пудиков, A. A. Gogina, И. И. Климовских, Giovanni Di Santo, L. Petaccia, A. Varykhalov, A. M. Shikin
Abstract
We show that graphene can be magnetized by coupling to a ferromagnetic Co film through a Au monolayer. The presence of dislocation loops under graphene leads to a ferrimagnetic ordering of moments in the two C sublattices. It is shown that the band gap of ∼80 meV in the K[over ¯] point has a magnetic nature and exists for ferrimagnetic ordering. Interplay between Rashba and exchange couplings is evidenced by spin splitting asymmetry in spin-ARPES measurements and fully supported by DFT calculation of a (9×9) unit cell. Owing to sign-opposite Berry curvatures for K[over ¯] and K[over ¯]^{'} valleys, the synthesized system is promising for the realization of a circular dichroism Hall effect.