Public Seminar by Advanced Materials Thrust, Function Hub , HKUST(GZ) - Phase field modeling of topological domain in ferroelectric and ferromagnetic materials
The non-collinear topological domains in ferroelectric and ferromagnetic materials, such as vortices and skyrmions, have recently received considerable attention due to their emerging functionalities and potential application. How to effectively manipulate topological domain is the main challenge for its practical application in new logical and memory devices. The traditional manipulation of topological domain by magnetic field or electrical current has the disadvantage of applying local magnetic field or producing Joule heat, so there is an urgent need to develop new methods for manipulating topological domains. Because ferroelectric and ferromagnetic materials often exhibit excellent multi-field coupling properties, it is possible to manipulate the topological domain by a mechanical way. In this work, we developed real-space phase field models to predict the topological domains (such as polarization vortices and magnetic skyrmions) under different conditions, and conducted an in-depth energy analysis on their formation mechanism. On this basis, the mechanical manipulation of topological domain was proposed and the dynamics of topological domain under different external fields was studied, which provides a theoretical basis for its application in the new generation of logical and memory devices.
Jie Wang is a Professor in the Department of Engineering Mechanics at Zhejiang University. He received his Ph.D. degree from the Hong Kong University of Science and Technology in 2006. He has been worked as a Humboldt research fellow and a JSPS research fellow at the Karlsruhe Institute of Technology in Germany and Kyoto University in Japan, respectively. In 2009, he joined Zhejiang University as an associate professor, and was promoted to full professor in 2015. From 2018 to 2023, he served as the deputy head of the Department. As PI, Prof. Wang has been awarded over ten highly competitive research projects from national and local funding institutions. He has published over 170 SCI papers in reputed journals such as Nature communications, Science Advances, Phys Rev Lett, Nano Letters, JMPS, Acta Mater, etc. He gave dozens of invited talks at the international conferences. He has organized or co-organized several international symposiums and workshops, and served as an Editorial Board Member for several scientific journals including Scientific Reports, and Materials. His research mainly focuses on the first-principle calculations and phase field modeling of the ferroelectric, ferromagnetic and multi-ferroic materials.