Structural and millimeter-wave characterization of flux grown Al substituted barium hexaferrite single crystals

Винник, Д.А.; Устинов, А. Б.; Жеребцов, Д. А.; Vitko, V. V.; Gudkova, S.A.; Zakharchuk, I.; Lähderanta, E.; Niewa, Rainer

doi:10.1016/j.ceramint.2015.06.105

Cited by 42 publications

(19 citation statements)

References 39 publications

(55 reference statements)

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“…Subsequently, the temperature evolution of electromagnetic, thermodynamics, mechanical, calorimetric, etc properties of the pure barium hexaferrite BaFe 12 O 19 have been extensively investigated as described elsewhere [2]. The interest on these compounds was recently revived due to the possibility to manipulate their functional properties by inducing crystal field distortions with dopants [3][4][5][6][7][8][9][10][11][12][13][14]. In particular, the values of the coercive force [15], Curie temperature [16,17], magnetic permeability and the dielectric permittivity reveal strong changes caused by doping and chemical substitution [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of chemical substitution on broadband dielectric response of barium-lead M-type hexaferrite

Alyabyeva¹,

Torgashev²,

Жукова³

et al. 2019

New J. Phys.

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We report on the electrodynamic properties of the single crystalline lead-substituted M-type barium hexaferrite, Ba 0.3 Pb 0.7 Fe 12 O 19 , performed in the broad frequency range including radio-frequency, terahertz and sub-terahertz bands, which are particularly important for the development of microelectronic devices. We demonstrate how changing on a molecular level the chemical characteristics (composition, intermolecular interaction, spin-orbital interaction) of lead-substituted M-type hexaferrite influences its radio-frequency and terahertz electrodynamic response. Our results indicate a critical temperature range, 50 K<T<70 K, where significant changes of the electrodynamic response occur that are interpreted as freezing of dynamical oscillations of bi-pyramidal Fe(2b) ions. In the range 5-300 K, the heat capacity shows no sign of any phase transition and is solely determined by electron and phonon contributions. An anomalous electrodynamic response is detected at 1-2 THz that features a rich set of absorption resonances which are associated with electronic transitions within the fine-structured Fe 2+ ground state and are visualized in the spectra due to magnetostriction and electron-phonon interaction. We show that lead substitution of barium in barium hexaferrite, BaFe 12 O 19 , leads to the emergence of a pronounced dielectric and magnetic relaxational dynamics at radio-frequencies and that both dynamics have the same characteristic relaxation times, thus evidencing the bi-relaxor-like nature of Ba 0.3 Pb 0.7 Fe 12 O 19 . We associate the origin of the relaxations as connected with the motion of magnetic domain walls. In order to unveil crucial influence of chemical substitution on electrodynamic characteristics of the compound, we analyze our results on substituted compound in comparison with the data available for pristine barium (BaFe 12 O 19 ) and pristine lead (PbFe 12 O 19 ) hexaferrites. The obtained spectroscopic data on the dielectric properties of Ba 0.3 Pb 0.7 Fe 12 O 19 provide insight into fundamental phenomena responsible for the absorption mechanisms of the compound and demonstrates that chemical ionic substitution is an effective tool to tune the dielectric properties of the whole family of hexaferrites.

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Section: Introductionmentioning

confidence: 99%

Influence of chemical substitution on broadband dielectric response of barium-lead M-type hexaferrite

Alyabyeva¹,

Torgashev²,

Жукова³

et al. 2019

New J. Phys.

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“…The combination of high coercive force (H c ∼ 160-55 kA m −1 ) with rather high residual induction allows them to be used as permanent magnets with satisfactory specific magnetic energy. 9 Their low conductivity (ρ ∼ 10 8 Ω cm) allows the application of hexaferrite magnets in the presence of high-frequency magnetic fields. For the first time, barium hexaferrite, isomorphic to PbO•6Fe 2 O 3 magnetoplumbite, was used by the Philips firm, 10 still in the 1950s.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the structural features and microwave absorption of doped barium hexaferrites

et al. 2017

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“…Для улучшения магнитных и функциональных свойств BaFe 12 O 19 обычно используют замещение ионов железа изовалентными диамагнитны-ми ионами D 3+ (изовалентное замещение) [31][32][33][34] или гетеровалентными диамагнитными ионами D 4+ или D 2+ (гетеровалентное замещение). Диамагнитное замещение в BFO изменяет особенности кристаллической структу-ры (искажения элементарной ячейки, микродеформации и изменения длин связей Fe−O) и магнитную структуру (ослабление магнитного обменного взаимодействия и фрустрации магнитной структуры).…”

Section: Introductionunclassified

Мессбауэровские исследования и микроволновые свойства гексаферритов бария с замещением ионами Al-=SUP=-3+-=/SUP=- и In-=SUP=-3+-=/SUP=-

Труханов¹,

Костишин²,

Коровушкин³

et al. 2018

Физика Твердого Тела

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The correlation of the chemical composition, the structure, and the microwave characteristic of solid solutions of the BaFe_12 – x D_ x O_19 (0.1 ≤ x ≤ 1.2) barium hexaferrite substituted with diamagnetic Al^3+ and In^3+ ions has been studied. The precise data on the crystal structure have been obtained by powder neutron diffraction using a high-resolution Fourier diffractometer (Dubna, JINR). The data on the distribution of the diamagnetic substituting ions in the hexaferrite structure have been obtained by Mössbauer spectroscopy. The microwave properties (the transmittance and the reflectance) have been studied in the frequency range 20–65 GHz and in external magnetic fields to 8 kOe. It is found that the transmission spectra are characterized by a peak that corresponds to the resonant frequency of the electromagnetic energy absorption, which is due to the ferromagnetic resonance phenomenon. The correlation of the chemical composition, the features of the ion distribution in the structure, and the electromagnetic properties has been revealed. It is shown that external magnetic fields shift the absorption peak of electromagnetic radiation to higher frequencies due to an increase in the magnetocrystal anisotropy. The results enable the conclusion that the features of the intrasublattice interactions and the electromagnetic properties should be explained using the phenomenological Goodenough–Kanamori model.

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Structural and millimeter-wave characterization of flux grown Al substituted barium hexaferrite single crystals

Cited by 42 publications

References 39 publications

Influence of chemical substitution on broadband dielectric response of barium-lead M-type hexaferrite

Influence of chemical substitution on broadband dielectric response of barium-lead M-type hexaferrite

Investigation into the structural features and microwave absorption of doped barium hexaferrites

Мессбауэровские исследования и микроволновые свойства гексаферритов бария с замещением ионами Al-=SUP=-3+-=/SUP=- и In-=SUP=-3+-=/SUP=-

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