Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Graphene II
O 42.1: Vortrag
Mittwoch, 16. März 2011, 11:15–11:30, WIL B321
Graphene edge magnetism for spintronics applications: Dream or Reality? — •Jens Kunstmann1, Cem Özdogan2, Alexander Quandt3,4, and Holger Fehske3 — 1Institute for Materials Science, TU Dresden, 01062 Dresden, Germany — 2Department of Computer Engineering, Cankaya University, Ankara, Turkey — 3Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Germany — 4School of Physics, University of the Witwatersrand, South Africa
We critically discuss the stability of edge states and edge magnetism in zigzag edge graphene nanoribbons (ZGNRs). We point out that magnetic edge states might not exist in real systems, and show that there are at least three very natural mechanisms – edge reconstruction, edge passivation, and edge closure – which dramatically reduce the effect of edge states in ZGNRs or even totally eliminate them. Even if systems with magnetic edge states could be made, the intrinsic magnetism would not be stable at room temperature. Charge doping and the presence of edge defects further destabilize the intrinsic magnetism of such systems. We conclude that edge magnetism within graphenes ZGNRs is much too weak to be of practical significance, in particular for spintronics applications. [1] J. Kunstmann, C. Özdoğan, A. Quandt, H. Fehske, arXiv:1007.2602 (2010).