1. Nuclear Technology Development Center, CDTN, Belo Horizonte 31270-901, Minas Gerais, Brazil
2. Laboratory-Factory of Rare Earth Alloys and Magnets (LabFabITR), Lagoa Santa 33400-000, Minas Gerais, Brazil
3. Department of Physics─Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, Minas Gerais, Brazil