Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: Graphene IV

O 67.3: Vortrag

Donnerstag, 17. März 2011, 11:45–12:00, WIL B321

Nucleation and growth of magnetic nanoclusters on graphene moiré on Rh(111) — •Philipp Leicht¹, Muriel Sicot¹, Samuel Bouvron¹, Ole Zander¹, Thomas Tietze², Eberhard Goering², Yuriy Dedkov³, and Mikhail Fonin¹ — ¹Fachbereich Physik, Universität Konstanz — ²Max-Planck-Institut für Metallforschung, Stuttgart — ³Fritz-Haber-Institut der Max-Planck Gesellschaft, Berlin

Magnetic nanoclusters with narrow size distributions are of key importance in modern nanotechnology. The bottom-up fabrication of self-organized nanoclusters on graphene moiré templates has been shown recently [1,2] and suggests a viable way to applications such as data storage. In this work, we use a graphene moiré grown on Rh(111) as a template. Submonolayers of ferromagnetic metals including Ni, Fe and Co are deposited on the graphene moiré template at room temperature and at low temperature around 150 K and are investigated by scanning tunneling microscopy and by x-ray magnetic circular dichroism (XMCD). Deposition at room temperature shows significant differences in the growth mode for Ni compared to Fe and Co. Whereas Ni preferentially forms flat triangles with alignment to the moiré structure of the graphene template, the growth of Fe clusters shows only little faceting. Deposition at low temperatures yields smaller clusters with hemispherical shape and a narrow size distribution. XMCD measurements on the Ni clusters are currently in progress to study their magnetic behavior. References: [1] A. T. N'Diaye et al, Phys. Rev. Lett. 97, 215501 (2006) [2] M. Sicot et al, Appl. Phys. Lett. 96, 093115 (2010)