1. College of Science, Gansu Agricultural University, Lanzhou 730070, China.
2. Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China.
3. Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research, Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore.