1. Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Korea
2. King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia
3. King Abdullah University of Science and Technology (KAUST), Computer, Electrical and Mathematical Science and Engineering Division (CEMSE), Thuwal 23955-6900, Saudi Arabia
4. KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea
5. Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea