Magnetoelectric and multiferroic media

Pyatakov, A. P.; Zvezdin, A. K.

doi:10.3367/ufne.0182.201206b.0593

Cited by 508 publications

(289 citation statements)

References 309 publications

Supporting

Mentioning

282

Contrasting

Unclassified

Order By: Relevance

“…Ferrotoroids will exhibit electric polarization (magnetization) in response to an external magnetic (electric) field. This magnetoelectric response is expected to form the basis for applications in technological areas, such as data storage, where for example an electric field can read or write information in the magnetic state of a medium 29,30 . In addition, ferrotoroids are expected to exhibit unique forms of magnetic response [31][32][33] and nonreciprocal reflection and dichroism 18 .…”

Section: Static Toroidal Multipolesmentioning

confidence: 99%

Electromagnetic toroidal excitations in matter and free space

et al. 2016

View full text Add to dashboard Cite

The toroidal dipole is a localized electromagnetic excitation, distinct from the magnetic and electric dipoles. While the electric dipole can be understood as a pair of opposite charges and the magnetic dipole as a current loop, the toroidal dipole corresponds to currents flowing on the surface of a torus. Toroidal dipoles provide physically significant contributions to the basic characteristics of matter including absorption, dispersion, and optical activity. Toroidal excitations also exist in free-space as spatially and temporally localized electromagnetic pulses propagating at the speed of light and interacting with matter. We review recent experimental observations of resonant toroidal dipole excitations in metamaterials and the discovery of anapoles, non-radiating current configurations involving toroidal dipoles. While certain fundamental and practical aspects of toroidal electrodynamics remain open for the moment, we envision that exploitation of toroidal response can have important implications for the fields of photonics, sensing, energy and information. IntroductionThe interactions of electromagnetic radiation with matter underpin some of the most important technologies today -from telecommunications to information processing and data storage; from spectroscopy and imaging to light-assisted manufacturing. Our understanding and description of the electromagnetic properties of matter traditionally involves the concept of electric and magnetic dipoles, as well as their more complex combinations, known as multipoles. Introduced by Maxwell and Lorentz and later refined by Jackson and Landau, this framework, termed the multipole expansion, is central in physics and is being routinely applied in the study of optical, condensed matter, atomic, nuclear phenomena and beyond 1 . Within this framework, electromagnetic media can be represented by a set of point-like multipole sources [2][3][4][5] . The commonly used set of multipoles comprises the electric and magnetic families, which can be represented by oscillating charges and loop currents respectively. Dynamic toroidal multipoles constitute a third independent family of elementary electromagnetic sources, rather than an alternative multipole expansion or higher-order corrections to the conventional electric and magnetic multipoles (see tutorial inset I).Introduced in 1958 by Y. B. Zeldovich, toroidal moments have been considered in systems of toroidal topology (see Fig. 1) and studied in the context of nuclear 6 , atomic 7 , and molecular physics 8 , classical electrodynamics 9,10 , and solid state physics 3 . In the field of electromagnetism, in particular, a number of works have led to the development of a complete theoretical framework for toroidal electrodynamics [11][12][13][14][15] and the prediction of exotic effects, including dynamic non-radiating charge current configurations 10 and non-reciprocal interactions 9 . Following recent experimental observations of toroidal contributions in the response of materials across the electromagnetic spectrum, dyn...

show abstract

Section: Static Toroidal Multipolesmentioning

confidence: 99%

Electromagnetic toroidal excitations in matter and free space

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Materials which combine two and more ferroic order parameters (multiferroics) have attracted extensive research interest in recent several years due to the possibility of effective cross control of their properties, providing an avenue for designing new multifunctional electronic devices [1][2][3]. In this respect, the coexistence of macroscopic polarization and magnetization is of particular importance, since their interference may offer an opportunity to control dielectric properties by magnetic field and vice versa.…”

Section: Introductionmentioning

confidence: 99%

“…The origin of the weak ferromagnetism in BiFeO 3 has been assigned by Kadomtseva et al [7] to a "magnetoelectric mechanism," where polarization acts as an internal electric field, generating the magnetization through magnetoelectric coupling. On the other hand, Ederer and Spaldin [8], by means of density functional calculations, found that the tilting of oxygen octahedra, which is also present in the polar structure of BiFeO 3 , is the relevant distortion to induce the spin canting. The phenomenological approach adopted by Kadomtseva et al [7] * dmitry.khalyavin@stfc.ac.uk † salak@ua.pt used the "minimal" centrosymmetric supergroup R3c1 as the parent symmetry to evaluate the form of the free-energy decomposition.…”

Section: Introductionmentioning

confidence: 99%

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

et al. 2014

View full text Add to dashboard Cite

A metastable perovskite BiFe 0.5 Sc 0.5 O 3 synthesized under high-pressure (6 GPa) and high-temperature (1500 K) conditions was obtained in two different polymorphs, antipolar P nma and polar I ma2, through an irreversible behavior under a heating/cooling thermal cycling. The I ma2 phase represents an original type of a canted ferroelectric structure where Bi 3+ cations exhibit both polar and antipolar displacements along the orthogonal [110] p and [110] p pseudocubic directions, respectively, and are combined with antiphase octahedral tilting about the polar axis. Both the P nma and the I ma2 structural modifications exhibit a long-range antiferromagnetic ordering with a weak ferromagnetic component below T N ∼ 220 K. Analysis of the coupling between the dipole, magnetic, and elastic order parameters based on a general phenomenological approach revealed that the weak ferromagnetism in both phases is mainly caused by the presence of the antiphase octahedral tilting whose axial nature directly represents the relevant part of Dzyaloshinskii vector. The magnetoelectric contribution to the spontaneous magnetization allowed in the polar I ma2 phase is described by a fifth-degree free-energy invariant and is expected to be small.

show abstract

“…These materials have been studied since the 1960s, but have recently received significant attention because a wave of new discoveries has led many to believe that relatively strong coupling effects could be obtained at room temperature. This would be extremely appealing since controlling magnetic states with electric fields could lead to a new generation of low-power, non-volatile memory devices [28]. The following classification has been proposed for multiferroics: type I multiferroics undergo an ordinary structural, non-polar to polar phase transition (usually involving the breaking of inversion symmetry) leading to ferroelectricity at high temperatures, while magnetic order develops during a separate phase transition at lower temperatures.…”

Section: Multiferroics (A) Introduction To Multiferroicsmentioning

confidence: 99%

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

Radaelli

Dhesi

2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

We review some of the significant contributions to the field of strongly correlated materials and complex magnets, arising from experiments performed at the Diamond Light Source (Harwell Science and Innovation Campus, Didcot, UK) during the first few years of operation (2007–2014). We provide a comprehensive overview of Diamond research on topological insulators, multiferroics, complex oxides and magnetic nanostructures. Several experiments on ultrafast dynamics, magnetic imaging, photoemission electron microscopy, soft X-ray holography and resonant magnetic hard and soft X-ray scattering are described.

show abstract

Magnetoelectric and multiferroic media

Cited by 508 publications

References 309 publications

Electromagnetic toroidal excitations in matter and free space

Electromagnetic toroidal excitations in matter and free space

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

Contact Info

Product

Resources

About