1. Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
2. Insititut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
3. Laboratory of Solid-State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium