1. Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea.
2. Research Institute of Advanced Materials, Seoul National University, Seoul, Republic of Korea.
3. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
4. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan.
5. Department of Chemistry, Seoul National University, Seoul, Republic of Korea.
6. Memory Thin Film Technology Team, Giheung Hwaseong Complex, Samsung Electronics, 445-701, Republic of Korea.
7. Department of Mechanical Engineering, University of Texas at Austin, 204 Dean Keeton Street, Austin, TX 78712, USA.
8. Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS UMR 6502, 2 Rue de la Houssinière, F-44322 Nantes, France.