Hexaferrite Permanent Magnetic Materials

Abu‐Aljarayesh, I.; Mahmood, Sami H.

doi:10.21741/9781945291074

Cited by 34 publications

(31 citation statements)

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“…The Curie temperature was evaluated by extrapolating the thermomagnetic curve to zero magnetic moment, and the results are listed in table 6. Although the Curie temperature of all samples decreased significantly in comparison with the un-doped SrFe 12 O 19 , the values recorded for these compounds are still higher than the best NdFeB commercial magnets. The observed decrease in T c is attributed to the decrease of the superexchange interaction between iron magnetic sublattices as a consequence of magnetic dilution caused by Al 3+ ions replacing Fe 3+ ions.…”

Section: Thermomagnetic Measurementsmentioning

confidence: 68%

“…The first generation of rareearth (RE) Sm-Co high performance PM, the (1-5) with composition (SmCo 5 ), was discovered in the mid-1960s, and introduced to the market in 1970. Further improvements led to the development of the second generation, the (2-17) family with the nominal commercial composition Sm(Co, Fe, Cu, Zr) 0.74 , which was introduced to the market in 1980 as a PM far superior to pre-existing ones ( [1,2] and references therein). Commercial Sm-Co PMs were produced with a remnant magnetization of ∼60-110 emu g −1 , and high intrinsic coercivity of 4.5-25 kOe.…”

Section: Introductionmentioning

confidence: 99%

“…Hexaferrite materials were discovered and characterized in the early 1950s [5][6][7], and received exponentially increasing interest since then due to their practical importance [8,9]. In addition to cost effectiveness, BaM hexaferrites (BaFe 12 O 19 ) are easy to produce with a wide range of tunable magnetic properties [10][11][12], and chemical stability required for a wide range of applications [8,[13][14][15][16][17][18][19][20][21]. The magnetic properties of BaM hexaferrites can be effectively modified by different of substitutions for Ba 2+ or Fe 3+ ions.…”

Section: Introductionmentioning

confidence: 99%

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Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr_1−xRE_xAl₂Fe₁₀O₁₉)

Al-Garalleh

Mahmood

Bsoul

et al. 2020

Mater. Res. Express

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We describe the synthesis and characterization of magnetic materials with improved magnetic properties for permanent magnet applications. Sr 1−x RE x Al 2 Fe 10 O 19 (RE=La, Ce, Tb, and Dy; x=0.0 and 0.1) were prepared by ball milling and sintering at 1200°C for 6 h. The effects of (Al 3+ -RE 3+ ) substitution on the structural and magnetic properties of SrM hexaferrites were investigated by x-ray diffraction, scanning electron microscopy, and magnetic measurements at low (5 K), and high temperatures (from room temperature to above Curie temperature). The sample with x=0, and that with La substitution, consisted of a single SrM phase. The rest of the samples contained traces of secondary oxide phases, and exhibited a small reduction in lattice parameters compared with the unsubstituted SrFe 12 O 19 . The coercivity of the samples (8800H cM 9750 Oe) was more than double the standard value of the unsubstituted compound, and the Curie temperatures was >300°C for all samples. Also, the saturation magnetization (32.5-46.4 emu g −1 ) was high enough to make the overall magnetic properties of these compounds potentially important for the permanent magnet industry.

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Section: Thermomagnetic Measurementsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr_1−xRE_xAl₂Fe₁₀O₁₉)

Al-Garalleh

Mahmood

Bsoul

et al. 2020

Mater. Res. Express

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“…Hexaferrites are widely used as essential components for a large variety of industrial and technological applications; automotive industry, electronic, telecommunication, data storage and processing, microwave devices, instrumentation, radar technologies, and motor industry [1][2][3][4][5][6][7]. Hexaferrites can be classified into six main types: M, Y, Z, W, X, and U, according to different stacking sequences of S, R, and T fundamental structural blocks in their crystal structure [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structural, and Magnetic Properties of Ba₃(Zn_xMg_1-x)₂Fe₂₄O₄₁ Z-Type Hexaferrites

et al. 2019

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This article is concerned with the synthesis of high-quality (Mg, Zn)2Z hexaferrites. A series of the ferrites Ba3(ZnxMg1−x)2Fe24O41 (x = 0.5, 0.7, and 1.0) were prepared by high-energy ball milling and sintering at 1250 • C for 2 h. The structural and magnetic properties of the samples were investigated using X-ray diffraction, scanning electron microscopy, and vibrating sample magnetometer. X-ray diffraction and thermomagnetic studies indicated that the Z-type phase was dominant at x = 0.5, and decreased with the increase of x, whereas the fraction of the Y-type hexaferrite increased. The saturation magnetization and initial permeability, however, increased slightly with the increase of x. The coercivity, on the other hand, was in the range 40-54 Oe for all samples, and the magnetocrystalline anisotropy field did not change significantly with increasing x. The FMR frequency estimated from the static magnetic parameters was ≈ 19 GHz for all samples.

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“…Based on their structures and chemical compositions, barium-based hexaferrites are classified into six main types [8]. In all of these ferrites, Ba can be replaced by Sr, Pb or other elements [9]. According to Gorter's model of a system of collinear spin structure [10], the net magnetic moment per molecule is given by the sum of the magnetic moments of magnetic ions in the molecule.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of efficient Pb dopant in R and R–S blocks of BaFe12O19 structure synthesized by co-precipitation method

2019

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Site occupancy plays an important role in the properties of the materials in general, and in the case of ferrites, this makes a significant effect. Barium ferrite has a wide range of applications ranging from everyday applications to sophisticated communication technologies. Two compositions Ba 1−x Pb x Fe 12 O 19 and BaPb x Fe 12−x O 19 (x = 0.0-1.0) were synthesized by co-precipitation method using similar synthesis conditions. The aim was to understand the different behaviors when Pb replaced Ba in R and R * blocks in the first composition, while in the second composition it replaced iron in RSR * S * blocks. Microstructural and morphological variations in both synthesized compositions because of Pb dopant were responsible for affecting all properties. Higher ionic radius (1.76 Å), lower melting point (950 °C) of lead and gradually increased concentration were responsible for generating stresses and distortions of different magnitudes in both compositions. Magnetic and DC electrical characterizations were investigated by applying similar conditions. Higher phase purity and better morphology are obtained when Ba is replaced by Pb. Strong variation in coercivity due to decrease in anisotropic energy is useful in high-density storage devices. For the other composition, when Fe is replaced by Pb, higher resistivity is obtained. The obtained range of resistivity is useful against eddy current losses in high-frequency devices.

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Hexaferrite Permanent Magnetic Materials

Cited by 34 publications

References 0 publications

Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr_1−xRE_xAl₂Fe₁₀O₁₉)

Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr_1−xRE_xAl₂Fe₁₀O₁₉)

Synthesis, Structural, and Magnetic Properties of Ba₃(Zn_xMg_1-x)₂Fe₂₄O₄₁ Z-Type Hexaferrites

Comparative analysis of efficient Pb dopant in R and R–S blocks of BaFe12O19 structure synthesized by co-precipitation method

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Hexaferrite Permanent Magnetic Materials

Cited by 34 publications

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Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr1−xRExAl2Fe10O19)

Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr1−xRExAl2Fe10O19)

Synthesis, Structural, and Magnetic Properties of Ba3(ZnxMg1-x)2Fe24O41 Z-Type Hexaferrites

Comparative analysis of efficient Pb dopant in R and R–S blocks of BaFe12O19 structure synthesized by co-precipitation method

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Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr_1−xRE_xAl₂Fe₁₀O₁₉)

Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr_1−xRE_xAl₂Fe₁₀O₁₉)

Synthesis, Structural, and Magnetic Properties of Ba₃(Zn_xMg_1-x)₂Fe₂₄O₄₁ Z-Type Hexaferrites