1 Supplementary Information Controlled modification of skyrmions information in a three-terminal racetrack memory Kang Wang, a,b Lijuan Qian, b See-Chen Ying, b Gang Xiao,* b and Xiaoshan Wu* 1 Affliations a Collaborative Innovation Center of Advanced Microstructures, Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China. E-mail: xswu@nju.edu.cn b Department of Physics, Brown University, Providence, Rhode Island 02912, USA. E-mail: gang_xiao@brown.edu Electronic Supplementary Material (ESI) for Nanoscale. This journal is © The Royal Society of Chemistry 2019