Magnetic phase diagram of TbMn$_{1-x}$Fe$_x$O$_3$ $(0 \leq x \leq 1)$ substitutional solid solution

TL;DR

This study maps the magnetic phase diagram of TbMn$_{1-x}$Fe$_x$O$_3$ across the entire composition range, revealing how Fe substitution influences magnetic ordering and phases, especially in relation to Mn and Tb sublattices.

Contribution

It provides the first comprehensive magnetic phase diagram for the entire substitution range, highlighting the roles of Mn, Fe, and Tb ions in magnetic behavior.

Findings

Mn dominates magnetic properties for 0 <= x < 0.3.

Fe sublattice drives magnetism for 0.3 < x <= 1.

Tb magnetic order occurs only at specific doping levels.

Abstract

We present the magnetic phase diagram of TbMn1-xFexO3 substitutional solid solution in the whole concentration range 0 <= x <= 1 as determined from magnetization and specific heat measurements. We have found that the dominant magnetic ion in the concentration range 0 <= x < 0.3 is manganese, while iron ions do not create independent magnetic structure, but strongly affect magnetic properties of the parent compound by reducing transition to magnetically ordered state and transition into a cycloidal phase. The magnetism in the concentration range 0.3 < x <= 1 is driven by the Fe sublattice. The manganese ions again do not order in long range magnetic ordered state, but stabilize four different magnetic structures of Fe sublattice above 2 K. The magnetic ordering of Tb sublattice was observed only on parent compounds TbMnO3 and TbFeO3 and for doping level below 0.1, or over 0.9.