1. Physics Department, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil
2. Graduate Program in Materials Science, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil
3. MackGraphe, Universidade Presbiteriana Mackenzie, 01302-907 São Paulo-SP, Brazil
4. Department of Physics, PUC-Rio, 22451-900 Rio de Janeiro-RJ, Brazil
5. Materials and Manufacturing Directorate, Air Force Research Laboratories, Wright-Patterson AFB, Ohio 45433, United States