1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
2. Memory Thin Film Technology Team, Hwaseong Campus, Samsung Electronics Co. LTD, 1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, Republic of Korea
3. Samsung Advanced Institute of Technology (SAIT), 129, Samsung-ro 320 Beon-gil,
Yeongtong-gu, Suwon-si, Gyeonggi-do 16706, Republic of Korea
4. DRAM Process Development, Semiconductor R&D Center, Samsung Electronics Co. LTD, Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, Republic of Korea