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Magnetic, compositional, and morphological properties of Zn–Fe-oxide core–shell bimagnetic nanoparticles were studied for three samples with 0.00, 0.06, and 0.10 Zn/Fe ratios, as obtained from particle-induced X-ray emission analysis. The bimagnetic nanoparticles were produced in a one-step synthesis by the thermal decomposition of the respective acetylacetonates. The nanoparticles present an average particle size between 25 and 30 nm as inferred from transmission electron microscopy (TEM). High-resolution TEM images clearly show core–shell morphology for the particles in all samples. The core is composed by an antiferromagnetic (AFM) phase with a Wustite (Fe1–yO) structure, whereas the shell is composed by a ZnxFe3–xO4 ferrimagnetic (FiM) spinel phase. Despite the low solubility of Zn in the Wustite, electron energy-loss spectroscopy analysis indicates that Zn is distributed almost homogeneously in the whole nanoparticle. This result gives information on the formation mechanisms of the particle, indicati...

the journal of physical chemistry c

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis