Abstract
Spinel-type oxides of general formula NiMn2–xMexO4 (Me = transition or non-transition metal) have been synthesized and characterized through their magnetic behavior. In this work we present the case of Me = Co, since, because of its high magnetic transition temperature, it is a potential candidate for technological applications. Two magnetic transitions are observed: a paramagnetic-to-ferrimagnetic transition at Tc, which depends on the overall composition and a second transition at lower temperatures, towards a specific ordering or a collinear Néel state. This second transition takes place at about 50 K, increasing with the cobalt content up to about 160 K. Under moderate applied fields, the ferrimagnetic state transforms into a ferromagnetic one. The electrical resistance shows three different regimes: semi conducting behavior at high temperatures, slight temperature dependence at the highest magnetic transition, and constant value at low temperatures. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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