Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 51: Transport: Graphene (Joint session of DS, DY, HL, MA, O and TT, organized by TT)
HL 51.13: Vortrag
Mittwoch, 9. März 2016, 13:00–13:15, H22
Spin lifetimes exceeding 12 ns in graphene non-local spin valves at room temperature — •Christopher Franzen1, Marc Drögeler1, Frank Volmer1, Tobias Pohlmann1, Maik Wolter1, Kenji Watanabe2, Takashi Taniguchi2, Christoph Stampfer1, and Bernd Beschoten1 — 12nd Institute of Physics and JARA-FIT, RWTH Aachen University, 52074 Aachen, Germany — 2National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
We present spin transport measurements on graphene non-local spin transport devices by fabricating
the electrodes first and subsequently transfer graphene with hexagonal boron nitride on top [1]. We achieve spin lifetimes of
12.6 ns and a spin diffusion length as high as 30 µm at room temperature.
This improvement exceeds all current models for contact-induced spin dephasing which paves the way towards probing intrinsic
spin properties of graphene. Furthermore, we investigate the contact properties of our devices
using scanning force microscopy (SFM) and conductive SFM. We discuss the importance of using
large area hexagonal boron nitride for the transfer process and for achieving such high spin lifetimes and spin diffusion lengths.
[1] M. Drögeler et al. Nano Letters 14, 6050 (2014).