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DS: Fachverband Dünne Schichten

DS 30: Transport: Graphene
(Joint session of DS, DY, HL, MA, O and TT, organized by TT)

DS 30.13: Talk

Wednesday, March 9, 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).