报告： Phase-field Modeling of Ferroic Heterostructures
报告人： Jiamian Hu （Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706）
摘要：Phase-field method is one of the most powerful tools for modeling the formation and evolution of microstructures in a wide variety of kinetic processes in materials. The application of phase-field modelling to understand and predict the domain pattern formation and dynamics in ferroic (e.g., ferroelectric, ferromagnetic, and multiferroic) materials has proven particularly successful. This presentation will start with a general introduction to the phase-field modeling of ferroic materials, followed by discussion on how phase-field modeling has been used to predict new types of magnetoelectric effects in multiferroic heterostructures comprised of juxtaposed ferromagnetic and ferroelectric materials. Examples include strain-mediated voltage-control of chiral magnetic textures such as domain-walls and skyrmions. The last part of the presentation will be focused on the development of dynamical phase-field model for understanding and predicting the response of ferroic domains to ultrafast external stimuli, including picosecond acoustic pulse, femtosecond laser pulse, and terahertz electric-field pulse.
Dr. Jiamian Hu is an Assistant Professor in the Department of Materials Science and Engineering and Grainger Institute for Engineering Fellow at the University of Wisconsin-Madison. His research group currently focuses on the phase-field model development for ferroic materials and devices as well as data-driven microstructure design. Dr. Hu has published over 60 articles (total citations: >3900; h-index=25) in peer-reviewed journals including a few high-profiles ones such as Nature Materials, Nature Communications, Science Advances, Advanced Materials, Nano Letters, ACS Nano; and has filed 2 US patents as the first inventor. He received the highest award for graduate students of Tsinghua University in 2012, Graduate Student Gold Award (2011) and Postdoctoral Award (2015) both from Materials Research Society, as well as the Graduate Excellence in Materials Science Diamond Award from American Ceramic Society (2012).