Antiferromagnetic to Ferrimagnetic Phase Transition and Possible Phase Coexistence in Polar Magnets (Fe$_{1-x}$Mn$_x$)$_2$Mo$_3$O$_8$

TL;DR

This study investigates the magnetic phase transitions in (Fe$_{1-x}$Mn$_x$)$_2$Mo$_3$O$_8$, revealing a transition from antiferromagnetic to ferrimagnetic states and potential phase coexistence, with implications for magnetic property tuning.

Contribution

The paper provides a detailed magnetic phase diagram and evidence for phase coexistence in (Fe$_{1-x}$Mn$_x$)$_2$Mo$_3$O$_8$, highlighting the tunability of magnetic properties via composition and temperature.

Findings

Antiferromagnetic phase for x<0.25

Ferrimagnetic phase for x>0.3

Magnetic properties can be tuned by Mn-content and temperature

Abstract

In the present work, magnetic properties of single crystal (Fe$_{1-x}$Mn$_x$)$_2$Mo$_3$O$_8$ ($0<x<1$) have been studied by performing extensive measurements. A detailed magnetic phase diagram is built up, in which antiferromagnetic state dominates for $x<0.25$ and ferrimagnetic phase arises for $x>0.3$. Meanwhile, sizeable electric polarization of spin origin is commonly observed in all samples, no matter what the magnetic state is. For the samples hosting a ferrimagnetic state, square-like magnetic hysteresis loops are revealed, while the remnant magnetization and coercive field can be tuned drastically by simply varying the Mn-content or temperature. Possible coexistence of the antiferromagnetic and ferrimagnetic phases is proposed to be responsible for the remarkable modulation of magnetic properties in the samples.