1. School of Materials
Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea
2. Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Korea
3. Department
of Nanomaterials Science and Technology, Korea University of Science and Technology, Daejeon, 34113, Korea
4. Center
for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Korea
5. KU-KIST Graduate
School of Converging Science and Technology, Korea University, Seoul, 02481, Korea
6. PCTP and Department
of Physics, Pohang University of Science and Technology, Pohang 37673, Korea