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arXiv · 1604.02222

Gate-tunable spin-charge conversion and a role of spin-orbit interaction in graphene

S. Dushenko·H. Ago·K. Kawahara·T. Tsuda·S. Kuwabata·T. Takenobu·T. Shinjo·Y. Ando·M. Shiraishi
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Abstract

The small spin-orbit interaction of carbon atoms in graphene promises a long spin diffusion length and potential to create a spin field-effect transistor. However, for this reason, graphene was largely overlooked as a possible spin-charge conversion material. We report electric gate tuning of the spin-charge conversion voltage signal in a single-layer graphene. Using spin pumping from yttrium iron garnet ferrimagnetic insulator and ionic liquid top gate we determined that the inverse spin Hall effect is the dominant spin-charge conversion mechanism in a single-layer graphene. From the gate dependence of the electromotive force we showed dominance of the intrinsic over Rashba spin-orbit interaction: a long-standing question in graphene research.

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S. Dushenko, H. Ago, K. Kawahara, T. Tsuda, S. Kuwabata, T. Takenobu, T. Shinjo, Y. Ando, M. Shiraishi. 2016-04-08. Gate-tunable spin-charge conversion and a role of spin-orbit interaction in graphene. https://doi.org/10.1103/physrevlett.116.166102

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