Gustav Bihlmayer

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Atomically thin layers of lanthanide materials are ideal systems to study the stability
of magnetic order in two dimensions. Open shell atoms like Dy or Ho show large magnetic
anisotropies even in small crystal fields. Species with quenched orbital moments (Gd or
Eu) can be adsorbed on or intercalated between graphene and magnetic substrates like
Co or Ni, also stacking several layers is possible. We analysed the exchange interaction
between the 4f layers and the 3d substrates and their modification by the graphene layers
using density functional theory (DFT). Comparison with experimental data shows good
agreement where available. Remarkably, the interaction between the 4f states and graphene
leads to spin-selective modifications of the π band that is observed both in angle resolved
photoemission spectroscopy experiments and the calculated band structures. We investigate
the origin of this effect and consequences for graphene's transport properties.

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Forschungszentrum Jülich
PH2
Contact: Jeison Fischer / Matteo Cacco