1. Mechanical Engineering Department, Federal University of Espirito Santo, Vitória, Brazil
2. Electrical Engineering Department, Federal University of Espirito Santo, Vitória, Brazil
3. i3N-CENIMAT, Department of Materials Science, School of Sciences and Technology, NOVA University of Lisbon, Caparica, Portugal
4. I3N and the Physics Department, Universidade de Aveiro, Campus Universitário de Santiago, Aveiro, Portugal