Anisotropy, Magnetostriction and Converse Magnetoelectric Effect in Dy Substituted Ni Ferrite

Majumder, Abhishek; Ugendar, Kodam; Baby, K. B. Anoop; Chunchu, Venkatarao; Mondal, Rajib; Markandeyulu, G.

doi:10.1016/j.phpro.2015.12.029

Cited by 15 publications

(9 citation statements)

References 11 publications

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“…In solids, the typical value of mode Grüneisen parameter ( ) is ~ 1 (see supplemental material [27] for details). Under the assumption of ~1, the volume magnetostriction of 15R-BaMnO3 at 4 K is estimated to be in the range of 0.01 to 5.6x10 -4 ( Figure S21 in supplementary material [27]), which is comparable to the range of reported magnetostriction values (10 -3 to 10 -6 ) in various systems [62][63][64][65][66][67][68] and also comparable to the value obtained through x-ray diffraction technique discussed above (see Figure S17-21 and Table S5 in the section SM8 of Supplemental material [27] for details on estimation of and magnetostriction in 15R-BaMnO3).…”

Section: Emergence Of New Raman Modes: Effect Of Magnetostrictionsupporting

confidence: 67%

Signatures of magnetostriction and spin-phonon coupling in magnetoelectric hexagonal15R−BaMnO3

et al. 2020

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Spin-phonon coupling, the interaction of spins with surrounding lattice is a key parameter to understand the underlying physics of multiferroics and engineer their magnetization dynamics. Elementary excitations in multiferroic materials are strongly influenced by spin-phonon interaction, making Raman spectroscopy a unique tool to probe these coupling(s). Recently, it has been suggested that the dielectric and magnetic properties of 15R-type hexagonal BaMnO3 are correlated through the spin-lattice coupling. Here, we report the observation of an extensive renormalization of the Raman spectrum of 15R-BaMnO3 at 230 K, 280 K, and 330 K. Magnetic measurements reveal the presence of a long-range and a short-range magnetic ordering in 15R-BaMnO3 at 230 K and 330 K, respectively. The Raman spectrum shows the appearance of new Raman modes in the magnetically ordered phases. Furthermore, an additional Raman phonon appears below ~ 280 K, possibly arising from a local latticedistortion due to the displacement of Mn-ions, that exhibits anomalous shift with temperature. The origin of the observed renormalization and phonon anomalies in Raman spectra are discussed based on the evidences from temperature-and magnetic-field-dependent Raman spectra, temperature-dependent x-ray diffraction, magnetization, and specific heat measurements. Our results indicate the presence of magnetostriction and spin-phonon coupling in 15R-BaMnO3 thus suggesting that the optical phonons are strongly correlated to its magnetoelectric properties.

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Section: Emergence Of New Raman Modes: Effect Of Magnetostrictionsupporting

confidence: 67%

Signatures of magnetostriction and spin-phonon coupling in magnetoelectric hexagonal15R−BaMnO3

et al. 2020

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“…Phase identification by X-ray diffraction analysis confirmed that the as-prepared powders and as-fabricated ceramics comprised a single phase of NiFe 2 O 4 with a spinel crystal structure. Ceramics of high sintered density were obtained by single-step sintering at 1200°C (3.94 g/cm 3 ) and by two-step sintering at T 2 of 1150°C (3.84 g/cm 3 ). The grain size, observed by scanning electron microscopy, was slightly increased at higher sintering temperature.…”

Section: Discussionmentioning

confidence: 99%

“…No other diffraction peaks were identified in the nickel ferrite ceramic samples, which indicated an absence of impurity phases. The sintered density of the nickel ferrite ceramic fabricated by single-step sintering at 900°C was 3.63 g/cm 3 . The sintered density of the ceramic sintered at 1200°C was 3.97 g/cm 3 (Table 1).…”

Section: Characteristics and Properties Of Nickel Ferrite Ceramics Fabricated By Different Sintering Methodsmentioning

confidence: 99%

“…Materials with low coercivity and high levels of magnetic permeability, saturation magnetization and electrical resistivity [1][2][3][4][5] are in demand for a wide range of high frequency (>1 MHz) applications. They are required in information and communication devices, memory devices, sensors, ferrofluids, magnetic refrigeration systems, microwave absorbers and catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…It is a mixed metal oxide with the general formula of AB 2 O 4 . In NiFe 2 O 4 , the tetrahedral (A) sites are occupied by Fe 3+ ions and the octahedral (B) sites are occupied by Ni 2+ and Fe 3+ ions in equal proportions [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

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Nickel ferrite ceramics: combustion synthesis, sintering, characterization, and magnetic and electrical properties

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et al. 2021

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Nickel ferrite powders were prepared by combustion synthesis of Fe, Fe 2 O 3 and NiO using NaClO 4 as fuel. Nickel ferrite ceramics were fabricated by single-step and two-step sintering under various conditions. The effects of each sintering process on the densification, microstructure and properties of the ceramics were investigated. X-ray diffraction analysis of asprepared powders and as-fabricated ceramics confirmed a single-phase NiFe 2 O 4 with a cubic spinel crystal structure. Single-step sintering produced ceramics with a wider density range (3.63-3.97 g/cm 3 ) than two-step sintering (3.74-3.84 g/cm 3 ) and a wider grain size range (1.10-2.31 µm compared to 1.30-1.37 µm). Two-step sintering produced ceramics with greater microhardness (135.00-172.60 HV) than single-step sintering (65.33-153.00 HV). In both methods, higher sintering temperatures produced ceramics with greater saturation magnetization (M s ). The highest M s values were 62.84 emu/g from single-step sintering at 1200°C and 70.00 emu/g from two-step sintering at T 2 = 1150°C: H c was, respectively, 31.18 and 22.00 Oe. The ceramic sintered by the two-step method at T 2 of 1150°C presented superparamagnetic-like behavior of multi-domain magnetic materials, with high µ i and very low H c . The higher electrical resistivity (R), dielectric constant (ε r ) and quality factor of this ceramic support highfrequency data storage applications.

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Improvement of the coercivity of rod-like NiCuMg ferrites induced by substitution of Dy3+ ions for Fe3+ ions

Chen

et al. 2016

J Mater Sci: Mater Electron

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Anisotropy, Magnetostriction and Converse Magnetoelectric Effect in Dy Substituted Ni Ferrite

Cited by 15 publications

References 11 publications

Signatures of magnetostriction and spin-phonon coupling in magnetoelectric hexagonal15R−BaMnO3

Signatures of magnetostriction and spin-phonon coupling in magnetoelectric hexagonal15R−BaMnO3

Nickel ferrite ceramics: combustion synthesis, sintering, characterization, and magnetic and electrical properties

Improvement of the coercivity of rod-like NiCuMg ferrites induced by substitution of Dy3+ ions for Fe3+ ions

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