Low temperature ferromagnetism in Bi2MnMoO6 double perovskite material

Bi2MnMoO6, a double perovskite, was synthesized through combustion method. The crystal structure was determined by powder X-ray diffraction (XRD) and Rietveld refinement using FULLPROF. Bi2MnMoO6 crystallized with the R3 space group (#146) with a distorted cubic structure. Field emission scanning electron microscopy (FESEM) showed irregular spherical grains with varying sizes of ∼80-120 nm. Energy dispersive spectra (EDS) confirmed stoichiometric formations without any impurities. Infrared spectroscopy confirmed the formation of a double perovskite structure. A magnetic study showed a paramagnetic (PM) nature at room temperature and a ferromagnetic nature below 44 K. These results can be explained based on an exchange mechanism and anti-site disorder. Bi2MnMoO6's low Curie temperature with broad hysteresis makes it an ideal candidate for spintronic applications.