主题：Spin injection and precession into trilayer graphene lateral spin valves

时间：1月6日 10:30—11:30

地点：玉泉校区 行政楼208会议室

报告人：刘艳平博士

报告摘要（Abstract）:

We report on the electrical injection and detection of spin accumulation in trilayer-graphene/MgO/Permalloy lateral spin-valve (LSV) structure. Spin accumulation and spin precession in trilayer graphene are studied by non-local spin valve measurements at room temperature. The dependence of the non-local magnetoresistance on electrode spacing is investigated and the results indicate a spin diffusion length of ~2.0 μm at room temperature, while at T = 10 K, the diffusion length increases to 2.3 μm. Electrical detection of the spin precession confirms that the non-local signal originates from spin injection and transport. Fitting of the Hanle spin precession data yields a spin relaxation time of ~410 ps and a spin diffusion length of ~2.0 μm, which is consistent with the value obtained through the spacing dependence. These results indicate that trilayer graphene is an ideal candidate for the development of pure spin-current-based memory, logic and sensing devices.

报告人简介（Short biography）:

Dr. Liu Yanping has received his PhD in spintronics from Nanyang Technological University (NTU) in 2012 at Singapore and was awarded Chinese Government Award for Outstanding Self-Financed Students Abroad in 2012. He has done research as international Program Associate (IPA) at Quantum Nano-Scale Magnetics Laboratory (RIKEN)  at Japan. He is also a research scholar at Data Storage Institute of A*STAR (Singapore). He is now a research fellow at NTU. His research interest include quantum and spin transport in graphene nanostructures (graphene nanomesh (2D), nanoribbon (1D), quantum dot (0D)), photonics application in graphene and MoS₂ plasmonics nanostructures, dosimeter, radiation detection and protection.