1. College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China
2. Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia
3. College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, P. R. China
4. INSTM and Department of Physical and Chemical Sciences, University of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
5. Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany
6. Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany
7. Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
8. Department of Physics, Indian Institute of Technology Kanpur, Kanpur, 208016, India
9. CNR-IOM, TASC Laboratory, Area Science Park-Basovizza, 34139 Trieste, Italy
10. Department of Physics/Graduate Institute of Applied Physics, National Taiwan University, Taipei 10617, Taiwan
11. Faculty of Engineering and Institute of Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel
12. Department of Physics and Institure of Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel
13. Charles University, V Holesovickǎch 2, Prague 8, 18000 Prague, Czechia
14. CNR-IMM Istituto per la Microelettronica e Microsistemi, VIII strada 5, I-95121 Catania, Italy