Journal ArticleDOI
Lattice anharmonicity and polar soft mode in ferrimagnetic M-type hexaferrite BaFe12O19 single crystal
A. S. Mikheykin,Elena S. Zhukova,Elena S. Zhukova,Elena S. Zhukova,Viktor I. Torgashev,Anna G. Razumnaya,Yury I. Yuzyuk,Boris Gorshunov,Boris Gorshunov,Boris Gorshunov,A. S. Prokhorov,A. S. Prokhorov,Aleksandr E. Sashin,Aleksandr E. Sashin,A. A. Bush,Martin Dressel +15 more
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TLDR
In this article, the polar phonon modes in BaFe12O19 single crystal were studied in the temperature range from 6 to 300 K by polarized infrared spectroscopy, and it was shown that the phonon spectrum of the crystal is strongly anharmonic and unstable with respect to long-wavelength fluctuations of the dielectric permittivity along the hexagonal axis.Abstract:
The polar phonon modes in BaFe12O19 single crystal are studied in the temperature range
from 6 to 300 K by polarized infrared spectroscopy. The phonon spectrum of the crystal is
strongly anharmonic and unstable with respect to long-wavelength fluctuations of
the dielectric permittivity along the hexagonal axis. Our results suggests that in
BaFe12O19 hexaferrite symmetry lowering to the polar phase with
the space group P63
mc can be
expected.read more
Citations
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Journal ArticleDOI
Polarization origin and iron positions in indium doped barium hexaferrites
S.V. Trukhanov,S.V. Trukhanov,Alex Trukhanov,Vitalii Turchenko,An.V. Trukhanov,E.L. Trukhanova,Daria I. Tishkevich,V.M. Ivanov,T.I. Zubar,M.M. Salem,V.G. Kostishyn,L.V. Panina,Denis Vinnik,S.A. Gudkova,S.A. Gudkova +14 more
TL;DR: In this article, structural and magnetic parameters were determined including the unit cell parameters, ionic coordinates, thermal isotropic factors, occupation positions, bond lengths and bond angles, microstrain values and magnetic moments.
Journal ArticleDOI
Magnetic and dipole moments in indium doped barium hexaferrites
S.V. Trukhanov,S.V. Trukhanov,A.V. Trukhanov,A.V. Trukhanov,V.A. Turchenko,An.V. Trukhanov,Daria I. Tishkevich,E.L. Trukhanova,T.I. Zubar,Dmitry V. Karpinsky,V.G. Kostishyn,L.V. Panina,Denis Vinnik,S.A. Gudkova,S.A. Gudkova,Evgeny A. Trofimov,P. S. Thakur,Atul Thakur,Yujie Yang +18 more
TL;DR: In this paper, the crystal and magnetic structure of the doped BaFe12−xInxO19 samples were refined by the results of investigations using high resolution neutron powder diffraction and vibration sample magnetometry at different temperatures.
Journal ArticleDOI
Thermal evolution of exchange interactions in lightly doped barium hexaferrites
Sergei V. Trukhanov,Alex Trukhanov,V.G. Kostishyn,Larissa V. Panina,Vitalii Turchenko,I. S. Kazakevich,An.V. Trukhanov,E.L. Trukhanova,V.O. Natarov,Anatoly M. Balagurov +9 more
TL;DR: In this paper, the effect of light diamagnetic doping on the nature of indirect exchange interactions with temperature increase has been discussed, and the light-diamagnetic doping mechanism and magnetic structure model are proposed.
Journal ArticleDOI
Temperature evolution of the structure parameters and exchange interactions in BaFe12−xInxO19
S.V. Trukhanov,S.V. Trukhanov,A.V. Trukhanov,A.V. Trukhanov,L.V. Panina,V.G. Kostishyn,V.A. Turchenko,E.L. Trukhanova,E.L. Trukhanova,An.V. Trukhanov,An.V. Trukhanov,T.I. Zubar,V.M. Ivanov,Daria I. Tishkevich,Denis Vinnik,S.A. Gudkova,S.A. Gudkova,D.S. Klygach,M.G. Vakhitov,P. S. Thakur,Atul Thakur,Yujie Yang +21 more
TL;DR: In this paper, the authors investigated the effect of the substitution level and temperature on indium doped barium hexaferrites in high-resolution neutron powder diffraction and vibration sample magnetometry in temperatures up to 730 K.
Journal ArticleDOI
Pecularities of the magnetic structure and microwave properties in Ba(Fe1-xScx)12O19 (x<0.1) hexaferrites
An.V. Trukhanov,An.V. Trukhanov,K.A. Astapovich,Munirah Abdullah Almessiere,V.A. Turchenko,V.A. Turchenko,E.L. Trukhanova,V.V. Korovushkin,Abdulkarim Amirov,M.A. Darwish,M.A. Darwish,Dmitry V. Karpinsky,Dmitry V. Karpinsky,Denis Vinnik,D.S. Klygach,D.S. Klygach,M.G. Vakhitov,M.G. Vakhitov,Maxim V. Zdorovets,Artem Kozlovskiy,S.V. Trukhanov +20 more
TL;DR: In this article, the peculiarities of the fine atomic and magnetic structure, magnetic properties and microwave characteristics under Sc-substitution were investigated in Ba(Fe1-xScx)12O19 (x ≤ 0.1) solid solutions.
References
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Journal ArticleDOI
Hexagonal ferrites: A review of the synthesis, properties and applications of hexaferrite ceramics
TL;DR: The most important members of the hexaferrite family are shown below, where Me = a small 2+ ion such as cobalt, nickel, or zinc, and Ba can be substituted by Sr: • M-type ferrites, such as BaFe12O19 (BaM or barium ferrite), SrFe 12O19(SrM or strontium ferite), and cobalt-titanium substituted M ferrite, Sr- or BaFe 12−2xCoxTixO19, or CoTiM as discussed by the authors.
Journal ArticleDOI
Anharmonic effects in light scattering due to optical phonons in silicon
TL;DR: In this paper, light scattering of the linewidth and frequency shift of the optical phonon in silicon over the temperature range of 5-1400 K are presented. But they do not consider the four-phonon anharmonic processes.
Journal ArticleDOI
Crystal stability and the theory of ferroelectricity
TL;DR: In this article, it is shown that the parameters which determine the lattice vibrations of a diatomic ionic crystal may be chosen in such a way that the crystal will exhibit ferroelectric properties, and that anti-ferroelectric transitions may be regarded as the result of an instability of the crystal for a certain normal mode of vibration.
Journal ArticleDOI
Anharmonic Decay of Optical Phonons
TL;DR: In this article, an expression for the lifetime of an optical phonon decaying into two acoustical phonons, and its temperature dependence, was derived from perturbation theory, and the strength of the interaction was expressed in terms of the Gruneisen constant and the effect of a strain, equivalent to the instantaneous strain of a optical mode on the frequency spectrum of a linear chain with alternating force constants.
Journal ArticleDOI
Recent advances in processing and applications of microwave ferrites
Vincent G. Harris,Anton L. Geiler,Yajie Chen,S. D. Yoon,Mingzhong Wu,Aria Yang,Zhaohui Chen,Peng He,Patanjali V. Parimi,Xu Zuo,Carl E. Patton,Manasori Abe,Olivier Acher,Carmine Vittoria +13 more
TL;DR: In this article, a review of recent advances in the processing of microwave ferrites is presented, including self-bias magnetization, tunability of the magnetic anisotropy, low microwave loss, and volumetric and weight reduction.