Pena, O.Aucher, C.Guizouarn, T.Barahona, P.Lisboa Filho, Paulo Noronha [UNESP]Moure, C.2014-05-202014-05-202006-10-01Physica B-condensed Matter. Amsterdam: Elsevier B.V., v. 384, n. 1-2, p. 94-96, 2006.0921-4526http://hdl.handle.net/11449/32276Systematic studies in manganites of spinel structure have been undertaken. We report on the magnetic properties of two particular cases, in which one of the transition metals, Mg2+ is non-magnetic (NiMgxMn2-xO4) or presents a stable oxidation state, Cu2+ (CoxCuyMnzO4, x + y + z = 3). The magnetic behaviour is described with respect to varying contents of cobalt, copper or manganese. A ferrimagnetic transition is observed at 110-120 K, which depends on the cobalt content. Presence of copper increases the coercive field by a factor of ten with respect to the parent compound NiMn2O4. (c) 2006 Elsevier B.V. All rights reserved.94-96engmagnetic oxidesferrimagnetismspinelsArtigo10.1016/j.physb.2006.05.160WOS:000241020700029Acesso restrito13538624145320050000-0002-7734-4069