Structure and Magnetic Properties of Novel High-Magnetization Fe–Mn Powders Synthesized by Hydrogen Reduction of Nanoferrites
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We have previously reported a study of novel Fe–Mn powders doped with 0.1–0.2 at.% manganese prepared by the reduction of (Fe1-x, Mnx)3O4 nanopowders using hydrogen gas. We detected the presence of manganese in bcc iron phase in the Fe–Mn powders using X-ray absorption fine structure spectroscopy. The Fe–Mn powders exhibited coercivity values ranging between 0.1 and 1 Oe. The saturation magnetization of the Fe–Mn powders was comparable with that of bulk pure iron, i.e., 218 emu/g. The presence of manganese in bcc iron phase should normally reduce the magnetization and increase coercivity. We discuss the relationship between the magnetic properties and structure of the Fe–Mn powders investigated via detailed magnetization measurements, analysis using, transmission electron microscopy, and X-ray absorption fine structure spectroscopy.