1. Catalonia Institute for Energy Research – IREC Sant Adrià de Besòs Universitat de Barcelona 08028 Barcelona Catalonia Spain
2. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education & School of Physical Science & Technology Lanzhou University Lanzhou 730000 China
3. Institut de Ciència de Materials de Barcelona Campus de la UAB 08193 Bellaterra Catalonia Spain
4. Institute of Advanced Study Chengdu University Chengdu 610106 China
5. Key Laboratory of Flexible Electronics & Institute of Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
6. School of Physics and Electronic Information Engineering Qinghai Normal University Xining 810008 China
7. ICREA Pg. Lluís Companys 23 08010 Barcelona Spain