On the Theory of Stress-Magnetic Field Phase Diagram of the Finite Size Multiferroics: Competition between Ferro- and Antiferromagnetic Domains

TL;DR

This paper develops a theoretical framework for understanding how external magnetic and stress fields influence the domain structures and macroscopic properties of finite-size multiferroic materials, revealing unique strain and magnetization behaviors.

Contribution

It introduces a novel theoretical analysis of the interplay between stress and magnetic fields in multiferroics, highlighting the control of domain states and macroscopic responses.

Findings

Linear strain dependence on magnetic field in two-domain states

Stress induces bias in magnetization versus magnetic field

External fields enable control of domain structures

Abstract

Macroscopic properties of multiferroics, the systems that show simultaneously two types of ordering, could be controlled by the external fields of different nature. We analyze the behavior of multiferroics with antiferro-(AFM) and ferromagnetic (FM) ordering under the action of external magnetic and stress fields. A combination of these two fields makes it possible to achieve macroscopic states with different domain structures. The two-domain state obtained in this way shows a linear dependence of macroscopic strain vs magnetic field which is unusual for AFMs. A small but nonzero stress applied to the sample can also result in the bias of the magnetization vs magnetic field dependence.