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Magnetic properties of spinel-type oxides NiMn2-xMexO4

AuthorsGautier, J. L.; Moure Jiménez, Carlos ; Bodenez, V.; Cailleaux, X.; Ortiz, Juan; Peña, Octavio; Piriou, B.; Zúñiga, G.; Lisboa-Filho, P. N.
KeywordsMagnetic oxides
Ferrimagnetic properties
Magnetic exchange
Issue Date2005
PublisherSociedad Chilena de Química
CitationJ. Chil. Chem. Soc., 50, N° 3 (2005), págs: 617-623
AbstractNew materials, based on the well-known spinel compound NiMn2O4, have been synthesized and characterized from the magnetic point of view. The manganese cation was partially substituted in the general formula NiMn2-xMexO4 , by nonmagnetic and magnetic elements, such as Me = Ga, Zn, Ni and Cr (0 x 1). Prior to the determination of their magnetic properties, the non-substituted spinel NiMn2O4 was carefully characterized and studied as a function of the oxygen stoichiometry, based on the influence of the annealing atmosphere and quenching rate. The ferrimagnetic character was observed in all samples, with a paramagnetic-to-ferromagnetic transition temperature Tc stabilized at 110 K, and well defined long-range antiferromagnetic interactions at lower temperatures, which depend on the applied field and the substitute concentration
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