1. Grenoble Electrical Engineering Laboratory (G2ELab), University of Grenoble, 25 Rue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France
2. Laboratory for Materials, Organization and Properties (LMOP), University of Tunis El Manar, Campus Universitaire-El Manar, 2092 Tunis, Tunisia
3. STMicroelectronics, 38926 Crolles Cedex, France