1. Centre National de la Recherché Scientifique (CNRS), Institute of Engineering Univ. Grenoble Alpes (Grenoble INP), Laboratoire de Science et Ingénierie des Matériaux et Procédés (SIMAP), University Grenoble Alpes (UGA), 1130, Rue de la Piscine, Domaine Universitaire, BP75, 38402 Saint-Martin, France
2. Institute of Physics, University of Latvia, Miera iela 32, LV-2169 Salaspils, Latvia
3. Faculty of Electrical and Environmental Engineering, Riga Technical University, Azenes iela 12/1, LV-1048 Riga, Latvia
4. Electrical and Electronic, English Department, University of Cagliari, Via Marengo 2, 09123 Cagliari, Italy