报告人：Associate ProfessorWang Lan

Physics, School of Sciences

RMIT University

Melbourne, VIC 3000

报告题目：2D ferromagnetism and spintronic devices based on van der Waals heterostructure

报告时间：2018年6月22日（周五）上午9:30

报告地点：物理与电子工程学院4楼学术报告厅

主办单位：江苏省先进激光材料与器件重点实验室、物电学院、科学技术研究院

报告人简介：

皇家墨尔本理工大学王澜教授的团队于2015年末在澳大利亚墨尔本成立， 团队现有副教授1人，博士后2人，博士生4人。团队领导王澜教授拥有新加坡国立大学和美国明尼苏达大学双博士学位，现任皇家墨尔本理工大学物理系副教授，澳大利亚研究委员会未来低能电子技术卓越中心（FLEET：ARC Centre of Excellence in Future Low-Energy Electronics Technologies）纳米器件制造处主任。

团队目前主要研究方向是基于二维材料异质结，新奇量子材料，拓扑绝缘体的电子器件和自旋电子器件的电子输运测量。主要实验方法是生长单晶，薄膜，和纳米材料，并用二维材料机械剥离，二维材料堆叠，光刻，电子刻等方法制造基于这些材料的电子和自旋电子器件。目标是研究材料和器件物理，设计和制造下一代自旋电子原型器件。近几年的首要目标是实现基于二维材料异质结（铁磁绝缘体包夹拓扑绝缘体）的量子反常霍尔效应。

Abstract—Two dimensional (2D) van der Waals (vdW) materials, consisting of atomically thin layers, have fascinating physical properties and intriguing thickness-dependent characteristics. To date, research on these materials has predominantly focused on various devices based on their optical and electronic properties,whilst reports on magnetic and spintronic devices based on 2D vdW materials are scarce, because vdW materials with desirable magnetic properties have yet to be found. By performing anomalous Hall-effect transport measurements, we reveal that the magnetic properties of single crystalline vdW Fe₃GeTe₂ vary dramatically with thickness. Importantly, a single hard magnetic phase with a near square-shaped magnetic loop, large coercivity (up to 550 mT at 2 K) and strong perpendicular magnetic anisotropy were all observed in Fe₃GeTe₂nanoflakes. These merits make Fe₃GeTe₂ the first vdW ferromagnetic material suitable for fabricating vdW magnetic heterostructures. Based on this material, various spintronic devices has been designed and fabricated.