1 Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000, Sart Tilman, Belgium.
2 Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTM), Institut de la Matière Condensée et des Nanosciences (IMCN), Université catholique de Louvain, 1348, Louvain-la-Neuve, Belgium.
3 Institut Néel, CNRS, Université Grenoble Alpes, 38042, Grenoble, France.
4 Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000, Sart Tilman, Belgium. asilhanek@uliege.be.