1. Department of Materials Science and Engineering Yonsei University 50 Yonsei‐ro, Seodaemun‐gu Seoul 03722 Republic of Korea
2. Department of Chemical & Biomolecular Engineering Yonsei University Seoul 03722 Republic of Korea
3. Insulation Materials Research Center Korea Electrotechnology Research Institute (KERI) Changwon 51543 Republic of Korea
4. Spin Convergence Research Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea