Spin injection properties in trilayer graphene lateral spin valves

• Main Authors: Liu, Y. P., Idzuchi, H., Fukuma, Y., Rousseau, O., Otani, Y., Lew, Wen Siang
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Science::Physics
• Online Access: https://hdl.handle.net/10356/96526; http://hdl.handle.net/10220/9938
• Institution: Nanyang Technological University

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.