Fert Beijing Institute;
MIIT Key Laboratory of Spintronics;
School of Integrated Circuit Science and Engineering;
Beihang University;
Beijing 100191;
China;
Key Laboratory of Materials Modification by Laser;
Ion;
and Electron Beams(Ministry of Education);
School of Materials Science and Engineering;
Dalian University of Technology;
Dalian 116024;
China;
Key Laboratory of Energy Materials and Devices(Liaoning Province);
School of Materials Science and Engineering;
Dalian University of Technology;
Dalian 116024;
China;
Department of Physics and State Key Laboratory of Surface Physics;
Fudan University;
Shanghai 200433;
China;
School of Information Science and Technology;
Shanghai Technology University;
Shanghai 201210;
China;
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology&Pohl Institute of Solid State Physics;
School of Physics Science and Engineering;
Tongji University;
Shanghai 200092;
China;
magnetic bubble; yttrium iron garnet; Kerr microscopy; spintronics;