Topological solitons and bulk polarization switch in collinear type II multiferroics

Abstract

We introduce a microscopic model for collinear multiferroics capable to reproduce, as a consequence of magnetic frustration and easy-axis anisotropy, the so-called "uudd" (or antiphase) magnetic ordering observed in several type II multiferroic materials. The crucial role of lattice distortions in the multiferroic character of these materials is entered into the model via an indirect magnetoelectric coupling, mediated by elastic degrees of freedom through a pantograph mechanism. Long range dipolar interactions set electric dipoles in the antiferroelectric order. We investigate this model by means of extensive DMRG computations and complementary analytical methods. We show that a lattice dimerization induces a spontaneous Z2 ferrielectric bulk polarization, with a sharp switch off produced by a magnetic field above a critical value. The topological character of the magnetic excitations makes this mechanism robust.

arXiv comment16 pages, 16 figures

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Cited by in corpus (4)

• Simple microscopic model for magneto-electric coupling in type-II antiferromagnetic multiferroics
• Double frustration and magneto-electro-elastic excitations in collinear multiferroic materials
• 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