# Magnetoelectric Phase Diagrams of Multiferroic GdMn2O5

## TL;DR

This study maps the magnetoelectric phase diagrams of GdMn2O5, revealing strong field-dependent phase transitions and supporting a model with two ferroelectric sublattices influenced by R-Mn interactions.

## Contribution

First detailed field-temperature phase diagrams of GdMn2O5, demonstrating the strong magnetoelectric coupling and phase transitions related to magnetic field orientation and strength.

## Key findings

- Dielectric permittivity highly sensitive to phase boundaries
- Multiple field-dependent phase transitions observed
- Phase diagram aligns with polarization changes due to Gd magnetic moments rotation

## Abstract

Electric and magnetic properties of multiferroic GdMn2O5 in external magnetic fields were investigated to map out the magnetoelectric phases in this material. Due to strong magnetoelectric coupling, the dielectric permittivity is highly sensitive to phase boundaries in GdMn2O5, which allowed to construct the field-temperature phase diagrams. Several phase transitions are observed which are strongly field-dependent with respect to field orientation and strength. The phase diagram for a magnetic field along the crystallographic a-axis corresponds well to a polarization step, as induced by 90 degree rotation of Gd magnetic moments. Our results support the model of two ferroelectric sublattices, Mn-Mn and Gd-Mn with strong R-Mn (4f-3d) interaction for the polarization in RMn2O5.