Institution: | 1. Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin, 17035, South Korea;2. Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Hanoi, Viet Nam;3. Department of Science Education, Chungbuk National University, Cheongju, 360-763, South Korea |