1. Materials Research and Technology Department, Luxembourg Institute of Science and Technology, 5 Avenue des Hauts-Fourneaux, L-4362 Esch/Alzette, Luxembourg.
2. Inter-Institutional Research Group Uni.lu-LIST on Ferroic Materials, 41 Rue du Brill, L-4422 Belvaux, Luxembourg.
3. Department of Physics and Materials Science, University of Luxembourg, 41 Rue du Brill, L-4422 Belvaux, Luxembourg.