Abstract
Cu1−xMnxO (0 ≤ x ≤ 0.08) nanoparticles were synthesized by a coprecipitation method. Powder x ray analysis reveals that samples show a pure CuO phase for x ≤ 0.06 and the appearance of a secondary phase CuMn2O4 for x > 0.06. The unit cell volume expands with increasing Mn concentration up to x = 0.06 and remains constant on further increase in Mn concentration. The undoped sample shows the behavior of pure CuO with antiferromagnetic transitions at TN1 = 228 K and TN2 = 214 K. Inclusion of Mn into the Cu sublattice turned antiferromagnetic CuO into a ferromagnet. The origin of ferromagnetism is analyzed on the basis of different possible interactions. It is believed that the indirect coupling between Mn ions mediated by O and Cu ions helps to stabilize the ferromagnetism.
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