Abstract
Polycrystalline YMn1−xFexO3 (YMFOx) (0 ≤ x ≤ 0.1) compounds have been prepared in single phase and characterized by synchrotron X-ray diffraction, X-ray absorption near edge spectroscopy, magnetization, and dielectric measurements. Iron-substitution in hexagonal YMnO3 causes intra-lattice changes exceeding those of the lattice cell. X-ray absorption near edge structure provides mixed-valence Mn3+/Mn4+ and Fe4+ charge states in these manganites, consistent with the observed decrease of the effective magnetic moment with Fe-doping. Magnetization M(T) evidence antiferromagnetic ordering of the specimens with little weak ferromagnetism, and the metrices of exchange interaction suppress with Fe-doping, attributed to the lengthening of the Mn–O planar bond lengths. Dielectric ε′(T) results showing highly doping-dependent anomaly at TN indicate linear magneto-electric coupling.
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