1. Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education
2. School of Physical Science and Technology
3. Lanzhou University
4. Lanzhou 730000
5. P. R. China
6. King Abdullah University of Science and Technology (KAUST)
7. KAUST Catalysis Center (KCC)
8. Physical Sciences and Engineering Division (PSE)
9. Thuwal 23955-6900
10. Saudi Arabia