作者机构:[1]School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China, [2]State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No 50571112), the National Basic Reseaxch Program of China (Grant No 2006CB601101) and the Program of Chinese Academy of Sciences (Grant No KJCX2-YW-W02).