Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Joint Session "Graphen: Spin Transport" (jointly with DS, DY, HL, O, TT)
MA 43.3: Vortrag
Donnerstag, 29. März 2012, 16:00–16:15, H 1012
Manipulation of spin transport properties in graphene — •Frank Volmer1,2, Tsung-Yeh Yang1,2, Eva Maynicke1,2, Marc Drögeler1,2, Sebastian Bläser1,2, Gernot Güntherodt1,2, and Bernd Beschoten1,2 — 1II. Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany — 2JARA: Fundamentals of Future Information Technology, 52074 Aachen, Germany
It has been shown that the dominant spin relaxation mechanism in bilayer graphene is of the D’yakonov-Perel’ type [1]. In this case the spin dephasing time increases with decreasing momentum scattering time or, respectively, with decreasing charge carrier mobility.
Therefore, it is desirable to control and to manipulate the mobility of a single device in order to get a further insight into the dephasing mechanisms. As the charge transport through the two-dimensional graphene is known to be strongly affected by adatoms, it is furthermore interesting to explore their influence on the spin transport. Hence we use current annealing, chemical solvents and electron beam induced deposition to add or to remove impurities on the graphene surface and study their influence on the spin transport properties.
First results indicate that even in single-layer graphene devices (non-local spin valves with Co/MgO injectors) a D’yakonov-Perel’-type dephasing mechanism is dominating.
This work has been supported by DFG through FOR 912.
[1] T.-Y. Yang et al., Phys. Rev. Lett. 107, 047206 (2011)