1. Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
2. Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon, Republic of Korea
3. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich GmbH, Jülich, Germany
4. Department of Energy Science, Sungkyunkwan University (SKKU), Suwon, Republic of Korea