Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Surface or interface magnetism
O 28.9: Vortrag
Dienstag, 23. März 2010, 12:30–12:45, H48
Intercalation of iron underneath graphene on Ni(111): PES and XMCD study — •Martin Weser, Karsten Horn, and Yuriy Dedkov — Fritz-Haber Institut der Max-Planck Gesellschaft, Berlin, Germany
Magnetic thin films with out-of-plane or perpendicular magnetic anisotropy play an important role in nanotechnology. Such systems can be used as perpendicular recording media, which is predicted to allow information storage densities of up to 1 Tbit/in.2 a quadrupling of today’s highest areal densities. Along with the widely used materials with out-of-plane magnetic anisotropy such as CoPt or FePt alloys, fcc Fe thin films also showing perpendicular magnetic anisotropy have recently attracted considerable interest as possible candidates for applications in novel magnetic data storage devices. Here Fe which originally has bcc structure can be stabilized in fcc γ-phase at room temperature in thin epitaxial films grown on suitable fcc substrates. The aim of the present work is the preparation of a fcc Fe-based system with potential out-of-plane magnetic anisotropy which behaves inert against an aggressive environment. Here we demonstrate the possibility to prepare such a system via intercalation of a thin Fe film underneath a graphene layer formed on a Ni(111) substrate. Here, we demonstrate that graphene behaves like a passivation layer conserving the underlying epitaxial Fe film. Electronic and magnetic properties of this system were studied by means of angle-resolved PES and XMCD, respectively.