Speaker: Cai Xinghan, Associate Professor, Shanghai Jiao Tong University
Date: Jan 08, 2020
Time: 3:30 p.m.
Location: Room 1111, Block C of Zhixin Building, Central Campus
Inviter: Chen Yanxue, Wang Yilin
Sponsor: the School of Physics
Recent discoveries of intrinsic layered ferromagnetism in insulating van der Waals crystals chromium trihalide (CrX3, X = Cl, Br or I) has created unprecedented opportunities for studying fundamental 2D magnetism and realizing novel functional devices. In this talk, I will discuss the magnetic structure of CrI3 and CrCl3 in the 2D limit by investigating the electron tunneling through their atomically thin flakes. I will demonstrate the intralayer ferromagnetic ordering and the layer-by-layer antiferromagnetic coupling in both CrI3 and CrCl3. The tunneling magnetoresistance (TMR) in CrI3 based magnetic tunnel junction is drastically enhanced with increasing CrI3 layer thickness owing to the spin-filtering effect, reaching a record of 19,000% for magnetic multilayer structures at low temperature. For atomically thin CrCl3, the weak magnetic anisotropy with an easy plane perpendicular to the c-axis is determined and its magnetic phase diagram is further constructed. This work offers a unique platform and a new means to explore the 2D ferromagnetism and engineer vdW spintronic devices.
Cai Xinghan received his PhD from the Department of Physics, University of Maryland, USA in 2015, and later worked as a research assistant in the Department of Physics, University of Washington. Since 2018, he has been an associate professor and doctoral supervisor in the School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University. He is mainly engaged in the research of magnetoelectricity and photoelectric characteristics of low-dimensional quantum system and related devices. He has published papers in authoritative journals such as Science, Nature Nanotechnology and Nature Physics for many times, and acted as the reviewer of famous journals such as Nature Communications.
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Edited by: Song Jinxu