Revealing the influence of Fe substitution on structural and magnetic features of orthomanganite DyMn2O5

Abstract

Tuning the physical property of a material through elemental substitution is always an important avenue to explore. Single phase orthomanganite DyMn2-xFexO5 (x =0-0.5) were synthesized via conventional co-precipitation method. Structural studies indicate orthorhombic structure with space group Pbam. Slight increase in cell volume is found with Fe- substitution at Mn site. Average particle size of samples was found to be reduced with incorporation of Fe3+ in DyMn2O5 lattice. Fe substitution reduces the exchange lengths between Mn-spins that increase the strength of magnetic Mn4+−O −Fe3+−O−Mn4+ interaction. M-T studies of Fe-substituted samples signify the appearance of FM contribution along with dominant AFM behavior. Transition temperature (TN2) varies systematically with Fe substitution and shifts towards higher temperature (from 42 to 68 K).