“…The negative Curie-Weiss temperature Y is about À65, À 195 and À 180 K for x ¼0.05, 0.15 and 0.25, respectively, indicating local antiferromagnetic (AFM) interaction in the samples. However, due to the plausible ferromagnetic (FM) impurity of ZnMn 2 O 4 , whose Curie temperature (T C ) is 1298 K [32], and the formation of ZnMnO 3 , whose magnetic behavior is spin-glass [33] or paramagnetic [34], the AFM interaction does not follow a simple evolution of strengthening with increasing x as most of the references [2,17,32]. [35].…”