1. Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education
2. School of Physical Science and Technology
3. Lanzhou University
4. Lanzhou 730000
5. P. R. China
6. Division of Physical Science and Engineering
7. King Abdullah University of Science and Technology (KAUST)
8. Thuwal 239955
9. Kingdom of Saudi Arabia
10. State Key Laboratory of Electronic Thin Films and Integrated Devices
11. University of Electronic Science and Technology
12. Chengdu 610054