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arXiv · 1810.12481

Room temperature spin Hall effect in graphene/MoS$_2$ van der Waals heterostructures

C. K. Safeer·Josep Ingla-Aynés·Franz Herling·José H. Garcia·Marc Vila·Nerea Ontoso·M. Reyes Calvo·Stephan Roche·Luis E. Hueso·Fèlix Casanova
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Abstract

Graphene is an excellent material for long distance spin transport but allows little spin manipulation. Transition metal dichalcogenides imprint their strong spin-orbit coupling into graphene via proximity effect, and it has been predicted that efficient spin-to-charge conversion due to spin Hall and Rashba-Edelstein effects could be achieved. Here, by combining Hall probes with ferromagnetic electrodes, we unambiguously demonstrate experimentally spin Hall effect in graphene induced by MoS$_2$ proximity and for varying temperature up to room temperature. The fact that spin transport and spin Hall effect occur in different parts of the same material gives rise to a hitherto unreported efficiency for the spin-to-charge voltage output. Remarkably for a single graphene/MoS$_2$ heterostructure-based device, we evidence a superimposed spin-to-charge current conversion that can be indistinguishably associated with either the proximity-induced Rashba-Edelstein effect in graphene or the spin Hall effect in MoS$_2$. By comparing our results to theoretical calculations, the latter scenario is found the most plausible one. Our findings pave the way towards the combination of spin information transport and spin-to-charge conversion in two-dimensional materials, opening exciting opportunities in a variety of future spintronic applications.

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C. K. Safeer, Josep Ingla-Aynés, Franz Herling, José H. Garcia, Marc Vila, Nerea Ontoso, M. Reyes Calvo, Stephan Roche, Luis E. Hueso, Fèlix Casanova. 2018-10-30. Room temperature spin Hall effect in graphene/MoS$_2$ van der Waals heterostructures. https://doi.org/10.1021/acs.nanolett.8b04368

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