Long-Periodic Magnetic Structure in Magnetoelectrics

Khalfina, A. A.; Шамсутдинов, М. А.

doi:10.1080/00150190214790

Cited by 22 publications

(19 citation statements)

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“…These results agree with formula (4) as well as the theoretical model [26] and symmetry analysis [27] carried out for domain walls in electric and magnetic fields applied simultaneously.…”

Section: Electric Polarization Of Magnetic Domain Wallssupporting

confidence: 91%

Electric polarization of magnetic textures: New horizons of micromagnetism

Pyatakov¹,

Мешков²,

Zvezdin³

2012

Journal of Magnetism and Magnetic Materials

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a b s t r a c tA common scenario of magnetoelectric coupling in multiferroics is the electric polarization induced by spatially modulated spin structures. It is shown in this paper that the same mechanism works in magnetic dielectrics with inhomogeneous magnetization distribution: the domain walls and magnetic vortexes can be the sources of electric polarization. The electric field driven magnetic domain wall motion is observed in iron garnet films. The electric field induced nucleation of vortex state of magnetic nanodots is theoretically predicted and numerically simulated. From the practical point of view the electric field control of micromagnetic structures suggests a low-power approach for spintronics and magnonics.

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“…These results agree with formula (4) as well as the theoretical model [26] and symmetry analysis [27] carried out for domain walls in electric and magnetic fields applied simultaneously.…”

Section: Electric Polarization Of Magnetic Domain Wallssupporting

confidence: 91%

Electric polarization of magnetic textures: New horizons of micromagnetism

Pyatakov¹,

Мешков²,

Zvezdin³

2012

Journal of Magnetism and Magnetic Materials

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“…Thus, if a micromagnetic structure breaks the central symmetry in a certain region of the crystal, then in this region an associated electric polarization can arise. This is the heart of the idea of an inhomogeneous magnetoelectric interaction [1,43,44] (which is also called the flexomagnetoelectric effect, in view of the similarity with the flexoelectric effect in dielectrics and liquid crystals [22,39]). …”

Section: Possible Mechanisms Of the Domain Wall Displacement Effectmentioning

confidence: 99%

Micromagnetism and topological defects in magnetoelectric media

Pyatakov¹,

Сергеев²,

Николаева³

et al. 2015

Phys.-Usp.

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This paper briefly reviews research of the magnetoelectric materials and multiferroics as domain-structured media. The review is focused on magnetoelectric phenomena in epitaxial iron garnet films (electrically induced displacement and tilting of domain boundaries) as a striking example of magnetoelectricity in micromagnetism. The paper also considers the effect of an electric field on other topological defects in magnetically ordered media, including Bloch lines and Bloch points at domain boundaries, magnetic vortices, and skyrmions.

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“…Like the Dzyaloshinskii-Moriya-like exchange (1a), this inhomogenous interaction is magnetoelectric in origin and a spin cycloid is only possible in the presence of spontaneous polarization. It is remarkable that inhomogenous magnetoelectric interaction (2) can explain magnetoelectric effect in magnetic domain walls [31][32][33] and ferroelectricity in spiral magnets [34] under the assumption of polarization induced by magnetic inhomogeneity. Furthermore, there is a profound analogy between spatially modulated spin structures in multiferroics, and spatially modulated structures in nematic liquid crystals [35,36].…”

Section: Fig 3 Experimental Evidences For Spin Cycloid Existence: (Amentioning

confidence: 99%

Phase transitions in multiferroic BiFeO₃crystals, thin-layers, and ceramics: enduring potential for a single phase, room-temperature magnetoelectric ‘holy grail’

et al. 2006

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Magnetic phase transitions in multiferroic bismuth ferrite (BiFeO3) induced by magnetic field, epitaxial strain, and composition modification are considered. These transitions from a spatially modulated spin spiral state to a homogenous antiferromagnetic one are accompanied by the release of latent magnetization and a linear magnetoelectric effect that makes BiFeO3-based materials efficient room-temperature single phase multiferroics.Since the beginning of the multiferroic era (in the early 1960s), after Soviet scientists discovered a new class of materials that was called "ferroelectromagnets" [1], to our present time, bismuth ferrite BiFeO 3 has remained the prototypical example of a multiferroic: having a relatively simple structure and at the same time quite diversified and uncommon properties.On the one hand due to its simple chemical and crystal structure, BiFeO 3 is a model system for fundamental and theoretical studies of multiferroics [2]. However, on the other hand, its unusual magnetic symmetry properties (space and time symmetry violation both in its crystal and magnetic structures) results in a variety of nontrivial consequences, including: (i) the unique coexistence of weak ferromagnetism and linear magnetoelectricity [3,4]; (ii) a toroidal moment, i.e., a special magnetic type of ordering [5][6][7][8]; (iii) the existence of an incommensurately modulated spin structure [9], previously only observed in magnetic metals; and (iv) magnetically induced optical second harmonic generation, observed for the first time in this particular material [10]. Furthermore, BiFeO 3 is the material with unique high ferroelectric Curie (T C =1083 K) [11] and antiferromagnetic Neel (T N =643K) [12] temperatures. However, its potential has yet to be realized, and might never be fully exploited. Difficulties persist as the magnetoelectric exchange and weak ferromagnetism are locked within a spin cycloid. A fundamental problem is that electronic configurations that favor magnetism are antagonistic to those that favor polarization [2] -compromise is necessary. Recently, investigations have shown that the multiferroic properties of BiFeO 3 can be dramatically increased by (i) epitaxial constraint [13], and/or (ii) rare earth substituents. These findings coupled with those in ME two-phase (nano and macro) composites of piezoelectric and magnetostrictive materials have served as triggers for a "magnetoelectric renaissance": the revival of hope to find a room temperature magnetoelectric material with significant coupling of polar and magnetic subsystems [14][15][16]. As a consequence, multiferroics are now being considered as promising materials for spintronics [17,18], magnetic memory systems, sensors, and tunable microwave devices [19]: offering the potential to revolutionize electromagnetic material's applications.

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Long-Periodic Magnetic Structure in Magnetoelectrics

Cited by 22 publications

References 0 publications

Electric polarization of magnetic textures: New horizons of micromagnetism

Electric polarization of magnetic textures: New horizons of micromagnetism

Micromagnetism and topological defects in magnetoelectric media

Phase transitions in multiferroic BiFeO₃crystals, thin-layers, and ceramics: enduring potential for a single phase, room-temperature magnetoelectric ‘holy grail’

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Long-Periodic Magnetic Structure in Magnetoelectrics

Cited by 22 publications

References 0 publications

Electric polarization of magnetic textures: New horizons of micromagnetism

Electric polarization of magnetic textures: New horizons of micromagnetism

Micromagnetism and topological defects in magnetoelectric media

Phase transitions in multiferroic BiFeO3crystals, thin-layers, and ceramics: enduring potential for a single phase, room-temperature magnetoelectric ‘holy grail’

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Product

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Phase transitions in multiferroic BiFeO₃crystals, thin-layers, and ceramics: enduring potential for a single phase, room-temperature magnetoelectric ‘holy grail’