Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.20: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Spin transport in graphene nanostructures — •Sebastian Schweitzer¹, Ajit Kumar Patra¹, Yenny Hernandez², Jan Rhensius³, Jakoba Heidler³, Matthias Eltschka¹, Mathias Kläui^1,3, Xinliang Feng², Laura Heyderman⁴, and Klaus Müllen² — ¹FB Physik, Uni Konstanz, Universitätsstr. 10, D-78457 Konstanz, Germany — ²MPI for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany — ³SwissFEL, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland & Laboratory for Nanomagnetism and Spin Dynamics, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland — ⁴Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland

Graphene, a monolayer of carbon atoms packed into a two-dimensional honeycomb lattice, is an exciting and promising material for spintronic applications. Due to its high mobility [1] it has a long spin diffusion length λ up to 2 µm [2]. However, λ is currently limited by the strong interaction between graphene and the substrate and by the corrugation in the graphene sheet, respectively. This can be overcome by using more robust turbostratic graphene (TG), a multilayer graphene stack without the usual Bernal stacking [3]. Therefore, enhancements in the mobility and the spin lifetime in TG are expected. Our recent results on spin-injection experiments using graphene as well as TG will be presented.

[1] A. K. Geim et al., Nature Materials 6, 183 (2007), Science 324, 1530 (2009). [2] N. Tombros et al., Nature 448, 571 (2007). [3] M. Orlita et al., Phys. Rev. Lett. 101, 267601 (2008).