Unified Model of Ferroelectricity Induced by Spin Order

Abstract

The ferroelectricity of multiferroics induced by spin order is commonly explained by considering either purely electronic or ion-displacement contribution. However, there is no general model which includes both effects simultaneously. Here, we suggest a realistic model to describe the ion-displacement part of the ferroelectricity based on the spin-lattice coupling Hamiltonian. Combining this model with our previous pure electronic model for spin-order induced polarization, we propose a unified model that includes both effects. By applying the unified model to representative multiferroics where the electronic and ion-displacement contributions vary widely, we find that this model can not only reproduce the first-principles results, but also provide insight into the origin of ferroelectricity.

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Cited by in corpus (11)

• Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
• Predicting a Ferrimagnetic Phase of Zn2FeOsO6 with Strong Magnetoelectric Coupling
• General Microscopic Model of Magnetoelastic Coupling from First-Principles
• Mechanisms and origin of multiferroicity
• Spin-Induced Polarizations and Non-Reciprocal Directional Dichroism of Multiferroic BiFeO${}_3$
• Recent Advances in Unconventional Ferroelectrics and Multiferroics
• Improper magnetic ferroelectricity of nearly pure electronic nature in cycloidal spiral CaMn${}_7$O${}_{12}$
• Electric Polarization in Inhomogeneous Crystals
• Computational studies on magnetism and ferroelectricity
• Sliding multiferrocity in van der Waals layered CrI${}_2$
• Magnetoelectricity of Topological Solitons in 2D Magnets