Effect of carbon substitution on the magnetic properties of ZnO nanomaterials
Y. F. Wang1*, Y. C. Shao1, S. H. Heish1, W. F. Pong1, C. T. Wu2, J. J. Wu2, J. W. Chiou3, H. M. Tsai4, C. W. Pao4, C. H. Chen4, H. J. Lin4, J. F. Lee4, T. Ohigashi5, N. Kosugi5, K. Saravaran6, Sekhar C. Ray6, K. H. Chae7
1Department of Physics, Tamkang University, New Taipei, Taiwan
2Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan
3Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan
4National Synchrotron Radiation Research Center, Hsinchu, Taiwan
5Institute for Molecular Science, Okazaki, Japan
6Inter University Accelerator Centre, New Delhi, India
7Korea Institute of Science and Technology, Seoul, Korea
* presenting author:Yu-Fu Wang, email:yfw0516@gmail.com
Intrinsic defects play a key role in modulating characteristics of nano-architectural ZnO materials, such as lattice structure, electric transports, optics and magnetism. Intrinsic defects induced room temperature ferromagnetism (RTFM) is one of interesting topics which is attracting large amount of researchers to unravel the mechanism behind it. We had used synchrotron-based microscopic and spectroscopic techniques to have a deeper discussion on this phenomenon, and found out that the zinc vacancy can result spin polarization in unpaired electrons on oxygen atoms which is the dominant defect for RTFM. To better understand how these intrinsic defects interact with each others to form RTFM and how non-magnetic dopant affects RTFM in nano-architectural ZnO materials, carbon ions have been implanted into nano-architectural ZnO.

Keywords: nanoarchitectural zinc oxide, carbon implantation, room temperature ferromagnetism, x-ray spectroscopy, scanning transmission x-ray microscope