1. Peter Grünberg Institut 7 and JARA‐FIT Forschungszentrum Jülich Jülich 52425 Germany
2. Institute for Electronic Materials (IWE 2) RWTH Aachen University Aachen 52062 Germany
3. Department of Energy Science Sung Kyun Kwan University Suwon Gyeonggi‐do 16419 Korea
4. Ernst Ruska‐Centre for Microscopy and Spectroscopy with Electrons (ER‐C) and JARA‐FIT Forschungszentrum Jülich GmbH Jülich 52425 Germany