1. Department of Physics, Sookmyung Women’s University, Seoul 04310, Korea
2. SK Hynix Inc., Icheon-si, Gyeonggi-do 17336, Korea
3. Lam Research Corp., Fremont, California 94538, United States
4. Versum Materials, Inc., Carlsbad, California 92011, United States
5. UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
6. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Korea