Journal ArticleDOI
Optical properties of BiFeO3 ceramics in the frequency range 0.3–30.0 THz
G. A. Komandin,Victor I. Torgashev,A. A. Volkov,O. E. Porodinkov,Igor E. Spektor,Alexander A. Bush +5 more
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In this paper, the infrared spectra of BiFeO3 ceramic samples have been measured using submillimeter spectroscopy (on a backward-wave tube spectrometer) and Fourier-transform infrared spectrographs in the frequency range from 5 to 1000 cm−1 at temperatures in the range from 10 to 500 K.Abstract:
Reflection and transmission infrared spectra of BiFeO3 ceramic samples have been measured using submillimeter spectroscopy (on a backward-wave tube spectrometer) and Fourier-transform infrared spectroscopy in the frequency range from 5 to 1000 cm−1 at temperatures in the range from 10 to 500 K. New resonant modes (probably, magnetic in nature) with the eigenfrequencies decreasing with an increase in the temperature have been recorded in the range 10–30 cm−1 by IR spectroscopy for the first time. An additional absorption with a fairly large dielectric contribution has been revealed in the range 30–60 cm−1. It has been demonstrated that the corresponding oscillators couple with both the lowest frequency phonon mode and the magnetic subsystem.read more
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Spin caloritronics, origin and outlook
TL;DR: In this paper, the authors present a review of spin caloritronics with respect to the thermodynamics of irreversible processes, including the Nernst or Hall effects, which are predicted on the basis that these tensors can include an anti-symmetric contribution.
Journal ArticleDOI
Non-Destructive Evaluation of Polymer Composite Materials at the Manufacturing Stage Using Terahertz Pulsed Spectroscopy
TL;DR: In this paper, a terahertz (THz) pulsed spectroscopy (TPS) was used for non-destructive control of polymer binder polymerization, since THz radiation is sensitive to changes of picosecond dynamics in media.
Journal ArticleDOI
Magnetically tunable silicon-ferrite photonic crystals for terahertz circulator
TL;DR: In this paper, a magnetically tunable circulator with a central operating frequency of 180 to 205 GHz and a maximum isolation of 65.2 dB was designed for terahertz applications.
Journal ArticleDOI
Strain effects on multiferroic BiFeO3 films
TL;DR: In this article, the effect of strain on BFO thin films was reviewed by describing the consequences on the structure and phase transitions as well as on polar, magnetic and magnetoelectric properties.
Journal ArticleDOI
An Analytical Study of Magneto-Plasmons in Anisotropic Multi-layer Structures Containing Magnetically Biased Graphene Sheets
TL;DR: In this article, an analytical model for the anisotropic multi-layer structures containing magnetically biased graphene sheets is proposed, where an external magnetic field is applied, normal to the structure surface.
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Journal ArticleDOI
Revival of the Magnetoelectric Effect
Abstract: Recent research activities on the linear magnetoelectric (ME) effect?induction of magnetization by an electric field or of polarization by a magnetic field?are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for 'large' ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90?V?cm?1?Oe?1 is achieved, which exceeds the ME response of single-phase compounds by 3?5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus 'large' if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.
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Structure of a ferroelectric and ferroelastic monodomain crystal of the perovskite BiFeO3
Frank Kubel,Hans Schmid +1 more
TL;DR: In this paper, a ferroelastic monodomain single crystal of BiFeO3 at space group R3c is described as a rhombohedrally distorted simple cubic perovskite cell.
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Multi-ferroic magnetoelectrics
TL;DR: In this paper, the authors reviewed the domain aspects of multi-ferroics, i.e. of materials, in which two or all three properties of the properties "ferroelectricity" and "ferromagnetism" occur simultaneously in the same phase, and in which the magnetic point group has been reliably established by magnetoelectric, optical, dielectric and related studies on single crystals and single domains.
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Room-temperature saturated ferroelectric polarization in BiFeO3 ceramics synthesized by rapid liquid phase sintering
TL;DR: In this article, a single-phased ferroelectromagnet BiFeO3 ceramics with high resistivity were synthesized by a rapid liquid phase sintering technique.
Journal ArticleDOI
Temperature dependence of the crystal and magnetic structures of BiFeO3
TL;DR: In this paper, the temperature dependence of structural and magnetic order parameters of BiFeO3 with rhombohedral perovskite structure was investigated by means of neutron diffraction on a powder sample.