Microscopic mechanism of spin-order induced improper ferroelectric polarization

Wang, P.S.; Lu, Xiaochen; Gong, X. G.; Xiang, Hongjun

doi:10.1016/j.commatsci.2015.08.041

Cited by 14 publications

(7 citation statements)

References 61 publications

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“…Taking only nearest neighbors is relevant since spins are quite large in the block approximation (therefore they can be treated as classical), the next nearest neighbors are far apart from each other, and the superexchange interaction plays the most important role on boundaries of the blocks. The prefactor − → P i,j must respect the crystal symmetry [22,38]. Taking the Y-hexaferrite crystal structure and the magnetic structure in the block approximation, the polarization along the z -axis has the following form [10,16,21]:…”

Section: E Microscopic Origin Of the Electromagnonmentioning

confidence: 99%

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Electromagnon in the Y-type hexaferrite BaSrCoZnFe11AlO22

Vít

Kadlec

et al. 2018

Phys. Rev. B

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We investigated static and dynamic magnetoelectric properties of single crystalline BaSrCoZnFe11AlO22 which is a room-temperature multiferroic with Y-type hexaferrite crystal structure. Below 300 K, a purely electric-dipole-active electromagnon at ≈ 1.2 THz with the electric polarization oscillating along the hexagonal axis was observed by THz and Raman spectroscopies. We investigated the behavior of the electromagnon with applied DC magnetic field and linked its properties to static measurements of the magnetic structure. Our analytical calculations determined selection rules for electromagnons activated by the magnetostriction mechanism in various magnetic structures of Y-type hexaferrite. Comparison with our experiment supports that the electromagnon is indeed activated by the magnetostriction mechanism involving spin vibrations along the hexagonal axis.

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Section: E Microscopic Origin Of the Electromagnonmentioning

confidence: 99%

“…Then, the possible electromagnon in BaSrCo 2 Fe 11 AlO 22 would be purely electricdipole active in the THz (or infrared) spectra. Such a coupling between the magnetic quadrupole and the electric dipole moments with the same symmetry can be explained by theory based on symmetry [19,22].…”

Section: Introductionmentioning

confidence: 97%

Electromagnon in the Y-type hexaferrite BaSrCoZnFe11AlO22

Vít

Kadlec

et al. 2018

Phys. Rev. B

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“…In the first model, we describe a unified model for spin order induced improper ferroelectric polarization, which can explain the polarization induced by any spin structures: collinear, cycloidal spiral, proper screw, etc. [52,[73][74][75][76] In the second model, we provide a new model for investigating the linear ME coupling effect [i.e., the first order change of magnetization (or electric polarization) response to the external electric (or magnetic) field].…”

Section: Theoretical Models For Multiferroicsmentioning

confidence: 99%

Computational studies on magnetism and ferroelectricity

Xu¹,

Feng²,

Xiang³

2022

Chinese Phys. B

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Magnetics, ferroelectrics and multiferroics have attracted great attentions because they are not only extremely important for investigating fundamental physics, but also have important applications in information technology. Here, recent computational studies on magnetism and ferroelectricity are reviewed. We first give a brief introduction to magnets, ferroelectrics, and multiferroics. Then, theoretical models and corresponding computational methods for investigating these materials are presented. In particular, a new method for computing the linear magnetoelectric coupling tensor without applying an external field in the first principle calculations is proposed for the first time. The functionalities of our home-made Property Analysis and Simulation Package for materials (PASP) and its applications in the field of magnetism and ferroelectricity are discussed. Finally, we summarize this review and give a perspective on possible directions of future computational studies on magnetism and ferroelectricity.

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“…Xiang et al proposed a unified polarization model to explain this magnetism driven polarization [86][87][88][89][90]. According to this model, the total polarization can be written as a sum of two contributions:…”

Section: Other Magnetoelectric Mechanisms In Multiferroicsmentioning

confidence: 99%

Magnetoelectricity in multiferroics: a theoretical perspective

Dong

Xiang

Dagotto

2019

National Science Review

179

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The key physical property of multiferroic materials is the existence of a coupling between magnetism and polarization, i.e. magnetoelectricity. The origin and manifestations of magnetoelectricity can be very different in the available plethora of multiferroic systems, with multiple possible mechanisms hidden behind the phenomena. In this Review, we describe the fundamental physics that causes magnetoelectricity from a theoretical viewpoint.The present review will focus on the main stream physical mechanisms in both single phase multiferroics and magnetoelectric heterostructures. The most recent tendencies addressing possible new magnetoelectric mechanisms will also be briefly outlined.Magnetism and electricity are two fundamental physical phenomena which have been widely covered in elementary textbooks of electromagnetism and have led to a broad technological revolution within human civilization. Even today, these two crucial subjects remain at the frontier of active research, and are still attracting considerable attention within the scientific community for their indispensable scientific value and possible applications. In solids, magnetism and electricity originate from the spin and the charge degrees of freedom, respectively. The crossover between these two fascinating topics has much grown in recent years and it has developed into an emergent branch of Condensed Matter Physics calledGenerally speaking, magnetoelectric effects can exist in many systems, even in some that are nonmagnetic. In fact, the first example of a magnetoelectric effect was observed by Röntgen in 1888 in a dielectric material, which was magnetized when moving through an electric field [10]. Much more recently, the surface state of topological insulators was predicted to manifest magnetoelectric effects [11]. However, to develop magnetoelectricity of a large magnitude, and as a consequence of more considerable practical value, multiferroics seem to be the best playground. In multiferroics, both magnetic moments and electric dipole moments can be ordered, inducing robust macroscopic quantities such as magnetization and polarization. Moreover, crucially for applications, both moments are coupled. Then, these macroscopic quantities may be mutually controlled, for example modifying the magnetization by an electric voltage or modifying the polarization by a magnetic field, which is particularly useful to design new devices, such as for storage and sensors.However, conceptually the mere existence of multiferroics is highly non trivial [12]. For most magnetic materials, the magnetic moments arise from unpaired electrons in partially occupied d orbitals and/or f orbitals. However, the spontaneous formation of a charge dipole usually needs empty d orbitals as a condition of having a coordinate bond, i.e. the so-called d 0 rule. Thus, the key ions involved in typical magnetic materials and those in polar materials are different, making these two areas of research nearly isolated from each other. However, in 2003 the discovery of a large polarizatio...

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Microscopic mechanism of spin-order induced improper ferroelectric polarization

Cited by 14 publications

References 61 publications

Electromagnon in the Y-type hexaferrite BaSrCoZnFe11AlO22

Electromagnon in the Y-type hexaferrite BaSrCoZnFe11AlO22

Computational studies on magnetism and ferroelectricity

Magnetoelectricity in multiferroics: a theoretical perspective

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