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Article Dans Une Revue Journal of Applied Physics Année : 2015

Ferromagnetic tunnel contacts to graphene: Contact resistance and spin signal

Alain Marty
Laurent Vila
Matthieu Jamet

Résumé

We report spin transport in CVD graphene-based lateral spin valves using different magnetic contacts. We compared the spin signal amplitude measured on devices where the cobalt layer is directly in contact with the graphene to the one obtained using tunnel contacts. Although a sizeable spin signal (up to similar to 2 Omega) is obtained with direct contacts, the signal is strongly enhanced (similar to 400 Omega) by inserting a tunnel barrier. In addition, we studied the resistance-area product (R. A) of a variety of contacts on CVD graphene. In particular, we compared the R. A products of alumina and magnesium oxide tunnel barriers grown by sputtering deposition of aluminum or magnesium and subsequent natural oxidation under pure oxygen atmosphere or by plasma. When using an alumina tunnel barrier on CVD graphene, the R. A product is high and exhibits a large dispersion. This dispersion can be highly reduced by using a magnesium oxide tunnel barrier, as for the R. A value. This study gives insight in the material quest for reproducible and efficient spin injection in CVD graphene. (C) 2015 AIP Publishing LLC.

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Dates et versions

hal-01588266 , version 1 (15-09-2017)

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Citer

Murat Cubukcu, M. B. Martin, Piotr Laczkowski, Céline Vergnaud, Alain Marty, et al.. Ferromagnetic tunnel contacts to graphene: Contact resistance and spin signal. Journal of Applied Physics, 2015, 117 (8), pp.083909. ⟨10.1063/1.4913710⟩. ⟨hal-01588266⟩
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