1. Korea Basic Science Institute, Daejeon, 169-148, Republic of Korea
2. Korea Basic Science Institute, Seoul Center, Seoul, 5, Republic of Korea
3. Device Development Department 2, Technology Development Division, Korea Advanced Nano Fab Center, 109 Gwanggyo-ro, Yeongtong-gu,
Suwon-Si, Gyeonggi-do, 443-270, Republic of Korea
4. Analytical Laboratory of Advanced Ferroelectric Crystals, Jeonju University, Jeonju, 303, Republic of Korea
5. Department of Science Education, Jeonju University, Jeonju, 303, Republic of Korea