Magnetoelectricity goes local: From bulk multiferroic crystals to ferroelectricity localized on magnetic topological textures

Pyatakov, A. P.

doi:10.1016/j.physb.2018.03.022

Cited by 16 publications

(12 citation statements)

References 42 publications

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“…Multiferroics, defined as materials with more than one ferroic long-range order [1,2,3], are ideal systems for fundamental studies of couplings among the order parameters of different nature, e.g. ferroelectric (FE) polarization, structural antiferrodistortion (AFD), ferromagnetic (FM) and antiferromagnetic (AFM) order parameters [4,5,6,7,8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic structural instabilities of domain walls driven by gradient coupling: Meandering antiferrodistortive-ferroelectric domain walls inBiFeO3

et al. 2019

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Using Landau-Ginzburg-Devonshire approach, we predict the intrinsic instability of the ferroelectricferroelastic domain walls in the multiferroic BiFeO3 emerging from the interplay between the gradient terms of the antiferrodistortive and ferroelectric order parameters at the walls. These instabilities are the interface analogue of the structural instabilities in the vicinity of phase coexistence in the bulk; and so they do not steam from incomplete polarization screening in thin films or its spatial confinement, electrostrictive or flexoelectric coupling. The effect of BiFeO3 material parameters on the 71 o , 109 o , and 180 o walls is explored, and it is shown that the meandering instability appears at 109 o , and 180 o walls for small gradient energies, and the walls become straight and broaden for higher gradients. In contrast to the 180 o and 109 o domain walls, uncharged 71 o walls are always straight, and their width increases with increasing the tilt gradient coefficient. The wall instability and associated intrinsic meandering provide a new insight into the behavior of morphotropic and relaxor materials, wall pinning, and mechanisms of interactions between order parameter fields and local microstructure.

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Section: Introductionmentioning

confidence: 99%

Intrinsic structural instabilities of domain walls driven by gradient coupling: Meandering antiferrodistortive-ferroelectric domain walls inBiFeO3

et al. 2019

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“…However, a wide range of ferroelectric and ferromagnetic materials do exist at room temperature. Recent experiments have shown that Neel-like domain walls in iron garnet films can possess a local polarization [149,157]. These localized multiferroic states are induced by an inhomogeneous magnetization pattern breaking the inversion symmetry (similar to the polarization in spin-driven ferroelectrics) [158] and exhibit a giant magnetoelectric effect.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…These localized multiferroic states are induced by an inhomogeneous magnetization pattern breaking the inversion symmetry (similar to the polarization in spin-driven ferroelectrics) [158] and exhibit a giant magnetoelectric effect. Such domain walls can be moved and transformed under electric field gradients [149,150,151,152,153,154,155,156,157,158,159,160] as well as exhibit electric modulations under AC magnetic fields [161]. Figure 3c shows a biased tip electrode close to a ferromagnetic domain wall in an iron garnet film.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Functional Ferroic Domain Walls for Nanoelectronics

2019

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A prominent challenge towards novel nanoelectronic technologies is to understand and control materials functionalities down to the smallest scale. Topological defects in ordered solid-state (multi-)ferroic materials, e.g., domain walls, are a promising gateway towards alternative sustainable technologies. In this article, we review advances in the field of domain walls in ferroic materials with a focus on ferroelectric and multiferroic systems and recent developments in prototype nanoelectronic devices.

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“…Recently, magneto-ferroelectric superlattices have drawn as much attention as magneto-electric (ME) materials. This is due to the intrinsic magneto-electric effects stemming from the spin-orbit interaction [52] as well as from the spin charge-orbital coupling [58]. It has been shown that surface ME effects appear due to the charge and spin accumulation [53,59].…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Crystals and Phase Transitions in Magneto-Ferroelectric Superlattices: Dzyaloshinskii–Moriya Interaction in a Frustrated J1 − J2 Model

Sharafullin

Diep

2019

Symmetry

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The formation of a skyrmion crystal and its phase transition are studied, taking into account the Dzyaloshinskii-Moriya (DM) interaction at the interface between a ferroelectric layer and a magnetic layer in a superlattice. Frustration is introduced in both magnetic and ferroelectric films. The films have a simple cubic lattice structure. The spins inside the magnetic layers are Heisenberg spins interacting with each other via nearest-neighbor (NN) exchange J m and next-nearest-neighbor (NNN) exchange J 2m . The polarizations in the ferroelectric layers are assumed to be of Ising type with NN and NNN interactions J f and J 2 f . At the magnetoelectric interface, a DM interaction J m f between spins and polarizations is supposed. The spin configuration in the ground state is calculated by the steepest descent method. In an applied magnetic field H perpendicular to the layers, we show that the formation of skyrmions at the magnetoelectric interface is strongly enhanced by the frustration brought about by the NNN antiferromagnetic interactions J 2m and J 2 f . Various physical quantities at finite temperatures are obtained by Monte Carlo simulations. We show the critical temperature, the order parameters of magnetic and ferroelectric layers as functions of the interface DM coupling, the applied magnetic field, and J 2m and J 2 f . The phase transition to the disordered phase is studied in detail.

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Magnetoelectricity goes local: From bulk multiferroic crystals to ferroelectricity localized on magnetic topological textures

Cited by 16 publications

References 42 publications

Intrinsic structural instabilities of domain walls driven by gradient coupling: Meandering antiferrodistortive-ferroelectric domain walls inBiFeO3

Intrinsic structural instabilities of domain walls driven by gradient coupling: Meandering antiferrodistortive-ferroelectric domain walls inBiFeO3

Functional Ferroic Domain Walls for Nanoelectronics

Skyrmion Crystals and Phase Transitions in Magneto-Ferroelectric Superlattices: Dzyaloshinskii–Moriya Interaction in a Frustrated J1 − J2 Model

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