Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Graphene III

O 41.5: Vortrag

Mittwoch, 28. März 2012, 11:30–11:45, MA 041

Intercalation of Ni underneath graphene on Ir(111) — •Philipp Leicht, Konstantin Krausert, Lukas Zielke, and Mikhail Fonin — Fachbereich Physik, Universität Konstanz, Germany

Interfaces of ferromagnetic materials and graphene have been reported as candidates with potential spin filtering capabilities [1]. Apart from direct growth of graphene on ferromagnetic Ni substrates, ferromagnetic metals can be intercalated between graphene and the substrate interface for many graphene/metal systems [2]. Thereby pre-deposited metals can penetrate graphene upon thermal annealing at moderate temperatures.

In this work we present the investigation of Ni intercalation underneath a graphene monolayer on Ir(111). We use scanning tunneling microscopy (STM) to determine the structure of the prepared samples with the intercalated Ni amount ranging from a submonolayer to few monolayers. Intercalation preferentially occurs at step edges forming areas with strongly increased moiré corrugation and decreased average distance of graphene from the intercalant compared to graphene/Ir(111). The stronger corrugation in conjunction with a shift of the C 1s core level observed in x-ray photo-electron spectroscopy suggests a strong bonding between graphene and Ni.

[1] Karpan, V. M. et al. Phys. Rev. B 78, 195419 (2008) [2] Huang, Li et al. Appl. Phys. Lett. 99, 163107 (2011)