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MA: Fachverband Magnetismus

MA 56: Graphene (jointly with DY, DS, HL, O, TT)

MA 56.3: Vortrag

Donnerstag, 17. März 2011, 15:45–16:00, HSZ 401

Long spin relaxation times in bilayer graphene — •Frank Volmer^1,2, Tsung-Yeh Yang^1,2, Jayakumar Balakrishnan³, Ahmet Avsar³, Manu Jaiswal³, Julia Samm^1,2, Syed Rizwan Ali^1,2, Alexandre Felix Pachoud^3,4, Ming-Gang Zeng^3,5, Mihaita Popinciuc^1,2, Barbaros Özyilmaz^3,4,5, Gernot Güntherodt^1,2, and Bernd Beschoten^1,2 — ¹II. Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany — ²JARA: Fundamentals of Future Information Technology, 52074 Aachen, Germany — ³Department of Physics, National University of Singapore, 117542 Singapore — ⁴NUS Graduate School for Integrative Sciences and Engineering (NGS), Centre for Life Sciences (CeLS), 117456 Singapore — ⁵Nanocore, National University of Singapore, 117576 Singapore

The demonstration of micrometer long spin relaxation lengths in graphene at room temperature has made this material a promising candidate for spintronic applications. We investigated the spin transport in the non-local spin valve geometry in bilayer graphene using MgO barriers for spin injection. We demonstrate that the dominant spin relaxation mechanism in bilayer graphene is of the D'yakonov-Perel' type. In this case the spin dephasing time scales inversely with the charge carrier mobility. At room temperature spin dephasing times of up to 2 ns are measured in samples with the lowest mobility.

This work has been supported by DFG through FOR 912.