Simple microscopic model for magneto-electric coupling in type-II antiferromagnetic multiferroics

Abstract

We present a simple two-dimensional model in which the lattice degrees of freedom mediate the interactions between magnetic moments and electric dipoles. This model reproduces basic features, such as a sudden electric polarization switch-off when a magnetic field is applied and the ubiquitous dimerized distortion patterns and magnetic $\uparrow \uparrow \downarrow \downarrow$ ordering, observed in several multiferroic materials of different composition. The list includes E-type manganites, RMnO${}_3$, nickelates such as in YNiO${}_3$ and other materials under strain, such as TbMnO${}_3$. In spite of its simplicity, the model presented here captures the essence of the origin of multiferroicity in a large class of type II multiferroics.

5 pages, 5 figures, Sup Info

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Cited by in corpus (2)

• Exploring magneto-electric coupling through lattice distortions: insights from a pantograph model
• Structural transition, spontaneous formation of strong singlet dimers and metamagnetism in $S=3/2$ magnetoelastic spin chains