1. College of Chemical Engineering and technology, Taiyuan University of Science and Technology, Taiyuan 030024, China
2. School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China
3. Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province, College of Material Science and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China
4. Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China