Spin-flop and incommensurate structures in magnetic ferroelectrics

Tehranchi, M.M.; Kubrakov, N. F.; Zvezdin, A. K.

doi:10.1080/00150199708222198

Cited by 48 publications

(36 citation statements)

References 4 publications

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“…(29). The fact that the nondiagonal tensor components of the linear ME effect are antisymmetric is evidence that the toroidal moment T z ( α 12 -α 21 ) will appear after the suppression of cycloid.…”

Section: Toroidal Orderingmentioning

confidence: 99%

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Space-time parity violation and magnetoelectric interactions in antiferromagnets

et al. 2004

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The properties of antiferromagnetic materials with violated space-time parity are considered. Particular attention is given to the bismuth ferrite BiFeO 3 ferroelectric magnet. This material is distinguished from other antiferromagnets in that the inversion center is absent in its crystal and magnetic structures. This circumstance gives rise to the diversified and unusual properties, namely, to the appearance of a spatially modulated spin structure and to the unique possibility of the linear magnetoelectric effect coexisting with a weak ferromagnetic moment. The magnetic-induced phase transitions accompanied by the suppression of the modulated spin structure and appearance of a number of new and unusual effects are considered. These are the linear magnetoelectric effect and the appearance of a toroidal moment and a weak ferromagnetic moment of the magnetoelectric nature.

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Section: Toroidal Orderingmentioning

confidence: 99%

“…The phase transitions in bismuth ferrite with an anharmonic cycloid were considered theoretically in [29].…”

Section: Spatially Modulated Structurementioning

confidence: 99%

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Space-time parity violation and magnetoelectric interactions in antiferromagnets

et al. 2004

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“…The exact solution that takes into account anisotropy gives the following expressions for the spin distribution and cycloid period [49,50]:…”

Section: Spatially Modulated Spin Structurementioning

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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“…Theoretical analysis done in [6,7,12] allowed calculate critical field of transition and determine the LME tensorα via components of antiferromagnetic vector l L{2M s . …”

Section: Incommensurate Long Periodical Spin Structuresmentioning

confidence: 99%

Magnetic Topological Structures in Multiferroics

et al. 2018

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In this article we focus on impact of micromagnetic structures on magnetoelectricity of multiferroics. We discuss physical mechanisms of magnetoelectric coupling considering domain walls and spin cycloids. We review the progress on multiferroic materials focusing on high temperature multiferroic: rare earth iron garnet and bismuth ferrite. We argue that topological structures play a pivotal role in multiferoics and show that electric control of magnetism can be carried out via spin spirals and domain walls. Magnetic domain walls produce ferroelectricity in rare earth iron garnets; transformations of spin cycloids release magnetoelectricity in bismuth ferrite. Ferroic orders couple via magnetic inhomogeneities, which shed new light on fundamental physics and applications.

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Spin-flop and incommensurate structures in magnetic ferroelectrics

Cited by 48 publications

References 4 publications

Space-time parity violation and magnetoelectric interactions in antiferromagnets

Space-time parity violation and magnetoelectric interactions in antiferromagnets

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

Magnetic Topological Structures in Multiferroics

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Spin-flop and incommensurate structures in magnetic ferroelectrics

Cited by 48 publications

References 4 publications

Space-time parity violation and magnetoelectric interactions in antiferromagnets

Space-time parity violation and magnetoelectric interactions in antiferromagnets

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

Magnetic Topological Structures in Multiferroics

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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’