Kai Liu
Physics Department, Georgetown University
地点：唐仲英楼A213
时间：2019-12-27 16:00
Three-dimensional arrays of nanomagnets offer exciting potentials for explorations of 3D information storage, spintronics and artificial spin ice. However, the synthesis and characterization of such nanostructures are often challenging. We have successfully realized novel, interconnected low density metallic nanowire networks, with density down to 10mg/cm3. More recently, we have investigated magnetization reversal in cobalt nanowire networks and the effects of intersections using magnetometry and the first order reversal curve (FORC) method. Analysis alongside arrays of non-intersecting wires shows similar hysteresis dominated by demagnetizing interactions when the magnetic field is applied parallel to most wires. The magnetization reversal mechanism in the intersecting wires depends strongly on the interconnected structure and the orientation relative to the applied field. The results demonstrate an interesting platform to encode information onto 3D nanomagnet arrays.
Prof. Kai Liu received his Ph.D. in Physics from the Johns Hopkins University in 1998. He then carried out postdoctoral research at the University of California – San Diego. He joined the University of California – Davis faculty in 2001, where he was promoted to Associate Professor in 2005 and Professor in 2008. He transitioned to the Georgetown University during 2018-19. Prof. Liu’s research focuses on synthesis and experimental investigation of nanostructured materials, particularly in nanomagnetism and spintronics. Prof. Liu was recipient of an Alfred P. Sloan Research Fellowship (2005) and a UC Davis Chancellor’s Fellowship (2007). He is an elected Fellow of the Institute of Physics (UK, 2011), American Physical Society (2012), IEEE (2016), and AAAS (2019). He served as the Program Co-Chair for the 2007 Annual Conference on Magnetism and Magnetic Materials in Tampa (2007 MMM) and the 2011 International Magnetics Conference in Taipei (2011 Intermag), and the General Chair for the 2016 MMM in New Orleans. He is serving as Secretary for the International Union of Pure and Applied Physics (IUPAP) Commission on Magnetism (2018-2020). He is also an Associate Editor for APL Materials.