1. Physics Department, Federal University of Amazonas (UFAM), Manaus, Amazonas 69077-000, Brazil
2. Institute of Engineering and Geo-sciences, Federal University of Western Pará (UFOPA), Santarém, Pará 68035-110, Brazil
3. Post-Graduation Program in Material Science & Engineering, Federal University of Amazonas (UFAM), Manaus, Amazonas 69077-000, Brazil
4. Physics Department, Federal University of Santa Catarina, Campus Universitário Trindade, S/N, C.P. 476, 88040-900 Florianópolis, Santa Catarina, Brazil