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 mu V at room temperature. A spin diffusion length of 1.5 mu m 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 mu m. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4776699]
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, JapanUniv Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
Idzuchi, H.
Karube, S.
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, JapanUniv Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
Karube, S.
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Fukuma, Y.
Aoki, T.
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, JapanUniv Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
Aoki, T.
Otani, Y.
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, JapanUniv Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan