简 历：Mr Mingliang Tian received his PhD degree from Wuhan University in1992 and was employed as a faculty member in University of Science and Technology of China between 1992-2001 and in Pennsylvania State University, USA, between 2001-2011. After 2011, he worked as a research scientist in China High Magnetic Field Laboratory, Chinese Academy of Science， and School of Physics and Materials Science, Anhui University, China. He has published more than 180 papers in reputed journals and has been serving as the Advisory Editorial Board member for the Journal of Magnetism and Magnetic Materials.
题 目：Magnetic Skyrmions in Confined Geometries
摘 要：Magnetic skyrmions are topologically stable whirlpool-like spin textures that offer great promise as information carriers for future ultra-dense memory and logic devices. To enable such applications, particular attention has been focused on the skyrmions in highly confined geometry such as nanodisks or one dimensional nanostripes or wires. Here, we systematically reviewed our recent effort on the real space visualization and manipulation of individual magnetic skyrmion in FeGe nanostripes or nanodisks by high resolution Lorentz transmission electron microscopy (TEM) and electron holography technique. We observed the flexibility of the shape of individual skyrmion tuned by the width and a unique field-driven helix-to-skyrmion cluster states transition directly. Also, a new state, called target skyrmion consisting of a central skyrmion surrounded by one or more concentric helical stripes and the magnetic bobbers are also identified. These findings demonstrate that the geometry defects can be used to control the formation of topologically nontrivial magnetic objects.