报告题目：Spintronics based on 2D ferromagnetic materials and Van der Waals heterostructures

报告人：王澜教授（RMIT University, School of Science, Melbourne, Australia）

主持人：赵宇军教授

报告时间：2019年11月19日（星期二）10:00

报告地点：物理楼（18号楼）二楼213室学术报告厅

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                   物理与光电学院

                   2019年11月15日

报告摘要：Van der Waals (vdW) ferromagnetic materials are rapidly establishing themselves as effective building blocks for next generation spintronic devices. When layered with non-magnetic vdW materials, such as graphene and/or topological insulators, vdW heterostructures can be assembled (with no requirement for lattice matching) to provide otherwise unattainable device structures and functionalities. We report a hitherto rarely seen antisymmetric magnetoresistance (MR) effect in van der Waals heterostructured Fe3GeTe2/graphite/Fe3GeTe2 devices. Unlike conventional giant magnetoresistance (GMR) which is characterized by two resistance states, the MR in these vdW heterostructures features distinct high, intermediate and low resistance states. This unique characteristic is suggestive of underlying physical mechanisms that differ from those observed before. After theoretical calculations, the three resistance behavior was attributed to a spin momentum locking induced spin polarized current at the graphite/FGT interface. We also report the spin orbit torque devices based on vdW heterostructures. Our work reveals that ferromagnetic heterostructures assembled from vdW materials can exhibit substantially different properties to those exhibited by similar heterostructures grown in vacuum. Hence, it highlights the potential for new physics and new spintronic applications to be discovered using vdW heterostructures.

报告人简介：Lan Wang was awarded a PhD degree in Materials Sciences in 2006 at the University of Minnesota – Twin Cities. After the defence of Wang’s PhD thesis in Jan 2006, Wang became an Assistant Professor at Nanyang Technological University in Singapore. He was the Principle Investigator of the Magnetic Materials and Spintronics Lab for the whole period at Nanyang Technological University (from 2006 to 2014). Dr. Wang has published over 100 peer reviewed articles in prestigious journals, including Nature Communications, Physical Review Letters, Nano Letters, etc. In November 2014, he joined RMIT University as an Associate Professor of Physics in the School of Science. Lan Wang is now the Leader of theme B of the ARC CoE – Future Low Energy Electronics Technologies.

His research interests focus on various quantum materials, including topological insulators, 2D semiconductors, etc. The aims are to understand the fundamental physics of these novel materials and to fabricate the next generation prototype electronic and spintronic devices.