School of Physics;
Hu azhong University of Science and Technology.Wuhan 430074;
People's Republic of China;
State Key Laboratory of Advanced Electromagnetic Engineering and Technology.Huazhong University of Science and Technology;
Wuhan 430074.People's Republic of China;
School of Electrical and Electric Engineering.Huazhong University of Science and Technology.Wuhan 430074;
People's Republic of China;
magnetic; field; configuration; vortex; structure; multipolar; field;