Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.72: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B1

Characterization of graphene on ferromagnetic materials — •Torsten Veltum, Hendrik Bettermann, and Mathias Getzlaff — Heinrich-Heine-Universität Düsseldorf

In the past few years graphene has gained the attention of scientists due to its unique mechanical and electrical properties. Perfect spin filtering has been predicted for interfaces between graphene and ferromagnetic materials. Iron nanoparticles have been shown to exhibit an in-plane magnetization alligned to that of a supporting thin film of a ferromagnetic material. In this study we want to discuss the properties of ferromagnetic surfaces regarding their suitability for graphene synthesis and their interaction with ferromagnetic nanoparticles.
Thin films of ferromagnetic materials like Ni, Co or Fe are prepared by electron beam evaporation on a W(110) crystal under ultra-high vacuum conditions. To achieve a structurally ordered monolayer graphene on the ferromagnetic substrate we use chemical vapor deposition with propylene. The structure of the thin film system is characterized in-situ by means of scanning tunneling microscopy (STM), low energy electron diffraction (LEED) and Auger electron spectroscopy (AES).
The well-characterized Fe nanoparticles are produced by a continuously working arc cluster ion source (ACIS), mass-selected by an electrostatic quadrupole (Δm/m = 10%) and subsequently deposited on the single-layer graphene under softlanding conditions. The structural analysis of the nanoparticles is carried out by STM.