TY  - JOUR
AU  - Huttmann, Felix
AU  - Klar, David
AU  - Atodiresei, Nicolae
AU  - Schmitz-Antoniak, Carolin
AU  - Smekhova, Alevtina
AU  - Martínez-Galera, Antonio J.
AU  - Caciuc, Vasile
AU  - Bihlmayer, Gustav
AU  - Blügel, Stefan
AU  - Michely, Thomas
AU  - Wende, Heiko
TI  - Magnetism in a graphene- 4 f − 3 d hybrid system
JO  - Physical review / B
VL  - 95
IS  - 7
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-01958
SP  - 075427
PY  - 2017
AB  - We create an interface of graphene with a metallic and magnetic support that leaves its electronic structure largely intact. This is achieved by exposing epitaxial graphene on ferromagnetic thin films of Co and Ni to vapor of the rare earth metal Eu at elevated temperatures, resulting in the intercalation of an Eu monolayer in between graphene and its substrate. The system is atomically well defined, with the Eu monolayer forming a (√3×√3)R30∘ superstructure with respect to the graphene lattice. Thereby, we avoid the strong hybridization with the (Ni,Co) substrate 3d states that otherwise drastically modify the electronic structure of graphene. This picture is suggested by our x-ray absorption spectroscopy measurements which show that after Eu intercalation the empty 2p states of C atoms resemble more the ones measured for graphite in contrast to graphene directly bound to 3d ferromagnetic substrates. We use x-ray magnetic circular dichroism at the Co and Ni L2,3 and Eu M4,5 as an element-specific probe to investigate magnetism in these systems. An antiferromagnetic coupling between Eu and Co/Ni moments is found, which is so strong that a magnetic moment of the Eu layer can be detected at room temperature. Density functional theory calculations confirm the antiferromagnetic coupling and provide an atomic insight into the magnetic coupling mechanism.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000394659700008
DO  - DOI:10.1103/PhysRevB.95.075427
UR  - https://juser.fz-juelich.de/record/827875
ER  -