1. Thin Film Physics Division, Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
2. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
3. Department of Mechanical Engineering, National University of Singapore, Block EA, 9 Engineering Drive 1, #07-08, Singapore 117576
4. Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, Building 779, 4000 Roskilde, Denmark
5. Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University, D-55131 Mainz, Germany
6. Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany