1. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry CAS Changchun 130022 China
2. University of Science and Technology of China Hefei 230026 China
3. Physical Science and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia
4. Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and Technology Lanzhou University Lanzhou 730000 China
5. Department of Energy Engineering Hanyang University Seoul 133‐791 Republic of Korea