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Controlling magnetism by purely electrical means is a key challenge to fast and energy efficient spintronics devices. Electrical control of magnetism has been explored in a variety of materials including dilute magnetic semiconductors, ferromagnetic metal thin films, magneto-electrics and multiferroics, but remains a formidable challenge. The recent discovery of two-dimensional van der Waals magnets [1-2] has opened a new door for electrical control of magnetism at the nanometer scale through the van der Waals heterostructure device platform.
In this talk, I will discuss our recent observations on electrical control of magnetism in 2D magnet CrI3, and how to utilize it to build a new prototype of spin transistor. In particular, in bilayer CrI3, we observed large linear magnetoelectric effect, whose sign and magnitude are solely determined by its spin symmetry [3]. We also demonstrated doping can drastically change the interlayer spin order, causing AFM-FM phase transition [4]. This electrical-tunable magnetic phase transition enables robust and reversible switching of magnetization in bilayer CrI3 by small gate voltages. With the above findings, we have built a new prototype of spin transistor: a spin tunneling field-effect transistors (Spin-TFET) based on dual-gated graphene/CrI3/graphene heterostructure [5].
References:
[1] Huang, B. et al. Nature 546, 270 (2017).
[2] Gong, C. et al. Nature 546, 265 (2017).
[3] Jiang, S., Shan, J. & Mak, K.F. Nature Materials 17, 406 (2018).
[4]Jiang, S., Li, L., Wang, Z., Mak, K.F. & Shan, J. Nature Nanotechnology 13, 549 (2018).
[5] Jiang, S., Li, L., Wang, Z., Mak, K.F. & Shan, J. arxiv: 1807.04898
2010年 南京大学材料科学与工程系获材料物理学士学位;
2015年 南京大学物理学院获凝聚态物理博士学位;
2015-2017年 在美国宾夕法尼亚州立大学物理系从事博士后研究;
2017年至今 在美国康奈尔大学物理系原子与固体物理实验室 (LASSP)和应用与工程物理学院 (AEP)从事博士后研究;
凝聚态物理实验方向. 主要研究兴趣为低维磁性与自旋电子学.