[1] Department of Physics,Beijing Normal University
[2] Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China
[3] Fert Beijing Institute,MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering,Beihang University
[4] State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University