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

Abstract

Tuning the physical properties of a material through elemental substitution is always an important avenue to explore. Single-phase orthomanganite DyMn_2−xFe_xO₅ (x = 0–0.5) was synthesized via the conventional co-precipitation method. Structural studies indicated an orthorhombic structure with the space group Pbam. A slight increase in cell volume was observed with Fe substitution at the Mn site. Average particle size of the samples decreased with the incorporation of Fe³⁺ into the DyMn₂O₅ lattice. Fe substitution reduces the exchange length between Mn-spins, increasing the strength of the magnetic Mn⁴⁺−O−Fe³⁺−O−Mn⁴⁺ interaction. M–T studies of Fe-substituted samples indicate the appearance of FM contribution along with dominant AFM behavior. The transition temperature (T_N2) varies systematically with Fe substitution and shifts towards higher temperatures (from 42 to 68 K).