1. Grup de Caracterització de Materials, Departament de Física, and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, 08019 Barcelona, Catalonia, Spain
2. Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France CNRS, LOMA, UMR 5798, F-33400 Talence, France
3. Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece