First-order-reversal-curve investigation of Pr-Fe-B-based exchange spring magnets - Cornejo, Daniel Reinaldo; Peixoto, T R F; Fichtner, Paulo Fernando Papaleo; Reboh, S; Franco, V C de; Villas-Boas, Valquíria; Missell, Frank Patrick (Encontro Nacional de Física da Matéria Condensada, 2010)