Junling Wang

Department of Physics Southern University of Science and Technology (SUSTech)
Fundamentals of Ferroelectric and Multiferroic Materials
Ferroelectric materials are crystals that exhibit spontaneous electric polarizations, which can be switched by an external electric field, below their Curie temperatures. Because of the lack of center of symmetry, they are also piezoelectric where applied stress to the crystal produces electric charges and applied electric field generates strain. Ferroelectricity was first discovered in Rochell salt in 1920. But research activity in the field only took off when perovskite oxide BaTiO3 was found to be ferroelectric in the 1940s. Since then, perovskite ferroelectrics have been widely used in transducers and actuators because of their excellent piezoelectric property. Non-volatile ferroelectric memory that makes use of their spontaneous polarization was also developed. In this tutorial, I will introduce the fundamentals of ferroelectricity, including the basic theory, properties and characterization techniques, as well as applications of ferroelectric materials. During the past 20 years, the field has been greatly enriched by the study of multiferroic materials, in which two or more ferroic orders (ferroelectric, ferromagnetic, ferroelastic and ferrotoroidic) coexist. At present, researchers have focused mostly on multiferroics that possess spontaneous electric and magnetic orders simultaneously, and antiferromagnetism is often included. The coupling between the two order parameters enables electric-field-control of magnetism, which is particular attractive for low-power spintronics. I will also discuss the unique properties and potential applications of multiferroic materials.
Presenter Bio

Professor Junling WANG obtained his B.S. degree from Nanjing University, China in 1999, and Ph.D. degree from University of Maryland, College Park in 2005. After a short postdoc training at PennState University, he joined Nanyang Technological University, Singapore as an Assistant Professor in 2006. He was promoted to Associate Professor with tenure in 2011 and Full Professor in 2017. In 2020, he joined Southern University of Science and Technology (SUSTech), China as a Chair Professor.

Professor Wang’s research activities focus on multiferroic materials. In particular, he is interested in 3D perovskites with the chemical formula of ABX3.These materials possess a wide range of exotic properties from highly insulating to superconducting, from dielectric to ferroelectric and multiferroic. His pioneering work on multiferroic BiFeO3 thin films has attracted much attention in the field. His recent work also includes 2D layered materials that possess ferroelectric and/or magnetic properties. He has published over 150 papers in high impact journals, including Science, Science Advances, Nature Materials and Nature Communications. His work has been cited more than 17000 times with an H-index of 52 (google scholar).

Through materials processing, structural and electrical/magnetic characterizations, he strives to understand the fundamental physics of multiferroic materials at low dimensions and develop new materials/devices for the next generation nanotechnology.

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