ECE Colloquium Series – Professor Xiaojia Wang
March 9 @ 3:30 pm - 5:00 pm
As part of the *Eleanore Hale Wilson Lecture Series, ECE is proud to present:
Probing Thermal and Magnetic Properties of Micro/nanostructured Materials Enabled by the Ultrafast Optical Pump-Probe Technique
Professor Xiaojia Wang
University of Minnesota
Host: Professor Mo Li
Micro-nanostructured materials behave differently from their macroscale counterparts with regards to transport properties at reduced time and length scales. The study of transport properties of micro/nanostructures with desirable functionalities for energy conversion has emerged as a new frontier in material science and nanotechnology. In the first half of this talk, we will emphasize how the state-of-the-art ultrafast Time-Domain Thermoreflectance (TDTR) and its upgraded version of Time-Resolved Magneto-Optical Kerr Effect (TR-MOKE) can be used to probe thermal transport properties with microscale spatial resolution and subpicosecond temporal resolution. We will demonstrate that TR-MOKE offers a novel way to explore the origins of the anisotropic thermal transport in black phosphorus with enhanced measurement sensitivities. In the second half of this talk, we will extend the capability of TR-MOKE to capture the spin precession dynamics of magnetic materials (Tungsten seeded CoFeB/MgO as an example system). The structure-property correlation of micro/nanostructured materials revealed by the ultrafast pump-probe technique opens up opportunities of tailoring materials’ properties by structure engineering at the atomic and molecular levels. Ultimately, these engineered materials, serving as the building blocks, hold great potential for device fabrication and performance optimization.
Dr. Xiaojia Wang started her official appointment as an assistant professor in the Department of Mechanical Engineering at the University of Minnesota, Twin Cities in 2014. Prior to this, she was a postdoctoral research associate in the Department of Materials Science and Engineering at the University of Illinois at Urbana-Champaign. She received her Ph.D. in Mechanical Engineering from the Georgia Institute of Technology in 2011, and her M.S. in 2007 and B.S. in 2004 from Xi’an Jiaotong University, China, all in Mechanical Engineering. Her current research focuses on (1) utilizing ultrafast optical techniques to characterize thermal and magnetic transport in micro/nanostructured materials and across material interfaces; and (2) tailoring the radiative properties of micro/nanostructures for energy conversion and harvesting. For details, please visit her research group website: http://www.me.umn.edu/labs/mnttl/.
*Established in 2009, the Eleanore Hale Wilson Fund supports engineering field leaders for travel to Minnesota to share their expertise and discoveries with University of Minnesota graduate students, faculty, and alumni. The fund also supports the receptions held in honor of each speaker.