Ferromagnetismo en manganitas sustituidas con plata de estructura perovskita

Abstract

A series of mixed oxides of general formula Sm$_{1 - x}$Ag$_{x}$MnO$_{3}$ with perovskite structure were prepared by first time by conventional solid-state reaction processing. The structure, morphology and magnetism of the samples are investigated. The X-ray diffraction patterns show that the x = 0.1 sample is a single perovskite structure, while x $ \ge $ 0.2, samples consist of a ferromagnetic perovskite phase and two nonmagnetic phases, Ag and Ag$_{1.8}$Mn$_{8}$O$_{16}$. The ferromagnetic behavior of Sm$_{1 - x}$Ag$_{x}$MnO$_{3}$ decrease with increase of Ag composition. The SEM analysis when x = 0.1 revealed that the random distribution of morphology and size of particles result of preparation method. The samples of Sm$_{1 - x}$Ag$_{x}$MnO$_{3}$ by x between 0.1 and 0.5 show that applying 10 T fields these cannot reach a saturation value.