2013，Spin injection properties in trilayer graphene lateral spin valves

Spin injection properties in trilayer graphene lateral spin valves.pdf

Abstract

We report on the electrical injection and detection of spin accumulation in trilayer-graphene/MgO/Permalloy lateral spin-valve (LSV) structure. Non-local spin valve signal is clearly observed in the (LSV), indicating that spin coherence extends underneath all ferromagnetic contacts.We also show that low-resistivity graphene/MgO/Py junctions enable efficient spin injection and detection in LSV with high applied current density, which leads to large spin accumulation of 120 μV at room temperature. A spin diffusion length of 1.5 μm was obtained for the injector-detector separation dependence of spin valve signal measurements carried out at room temperature, while at T=10 K, the diffusion length increases to 2.3 μm.