Crystal Structure, Magnetic and Mössbauer Properties of Dyfe X Mn1- X O3 Multiferroic Manganites

Abstract

The influence of iron replacement on the structural and magnetic properties of Dysprosium manganites was studied using the series of DyFe x Mn1- x O3 (x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0) composites. All samples were fabricated by means of auto-combustion sol-gel method followed with ball milling technique. Orthorhombic structure (Pnma space group) with excellent phase purity and crystallinity have featured all samples, according to X-ray diffraction analysis. The temperature dependence of magnetization curves indicated antiferromagnetic (AFM) to paramagnetic (PM) transition as the temperature increases. The Néel Temperature (TN) was observed to shift to higher temperatures, whereas the spin reorientation transition temperature (TSR) reduced as Fe3+ content increased. Cusps in the ZFC curves were detected at low temperature (around 4 K) as an indication of the ordering of the Dy spin. 57Fe Mӧssbauer spectra in samples with low iron content were dominated by a high spin (Fe3+) paramagnetic doublet at both 295 K and 78 K, while the distribution in the hyperfine magnetic field accounts for the appearance of the broadening magnetic peaks. High iron samples revealed a magnetic sextet with fit resolved patterns that indicate a strong AF coupling of Fe3+ ions. The hyperfine magnetic field (Bhf) magnitude demonstrated a linear increase with increasing iron doping.

Keywords: crystallography, multiferroic, manganite, Mӧssbauer spectroscopy, magnetic features