Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

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

O 35.81: Poster

Tuesday, March 12, 2013, 18:15–21:45, Poster B1

Torque magnetometry on large-area graphene — •Matthias Block¹, Stephan Albert¹, Stefanos Chalkidis¹, Florian Speck², Felix Fromm², Thomas Seyller³, Marc Wilde¹, and Dirk Grundler¹ — ¹Technische Universität München, Department Physik E10, James-Franck-Str. 1, 85747 Garching b. München — ²Universität Erlangen, Lehrstuhl für Technische Physik, Erwin-Rommel-Str. 1, 91058 Erlangen — ³Technische Universität Chemnitz, Institut für Physik, Technische Physik, Reichenhainer Str. 70, 09126 Chemnitz

Torque magnetometry performed at helium temperatures allows one to gain insight into the electronic properties of two-dimensional electron systems. Graphene with its unique electronic properties is in particular interesting. While much of fundamental knowledge about graphene was learned from small-sized exfoliated graphene, it is important for our technique to study large areas of graphene. We use graphene epitaxially grown on SiC as it offers similarly high electronic quality and is provided in wafer-scale sizes. For our experiment we use micromechanical cantilevers which are designed for sample sizes of 1.2 mm × 2 mm. We use SiC-graphene which has been characterized by Raman spectroscopy and atomic force microscopy to determine the amount of monolayer graphene. We report on our results of the magnetization measurements based on torque magnetometry. We acknowledge financial support by the DFG via project WI3320/1-1 in SPP 1459.