High-frequency Properties and Electromagnetic Wave Attenuation for Hexaferrite Composites

Li, Z. W.; Yang, Zhihong; Kong, Ling Bing

doi:10.1016/j.proeng.2013.11.004

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…It has a high value of saturation magnetization (Ms) of 72 emu/g (1 emu/g = 1 (A × m 2 )/kg) and a high Curie temperature of 450 • C. BaM shows large magnetocrystalline anisotropy, about 17 kOe along the c-axis [10]. Natural ferromagnetic resonance (NFMR) in M-type barium hexaferrite occurs in U-band (EHF range, 47-50 GHz) due to the anisotropy of the c-axis, and therefore, these materials can be used as microwave EMR absorbers [11][12][13]. Doping of barium hexaferrite with various diamagnetic ions (DI), such as Al 3+ , In 3+ , Ga 3+ , Co 2+ and Sc 3+ makes it possible to adapt the magnetic characteristics, and consequently, to control the range of operating frequencies up to 70 GHz [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

et al. 2019

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The paper describes preparation features of functional composites based on ferrites, such as “Ba(Fe1−xGax)12O19/epoxy,” and the results of studying their systems; namely, the correlation between structure, magnetic properties and electromagnetic absorption characteristics. We demonstrated the strong mutual influence of the chemical compositions of magnetic fillers (Ba(Fe1−xGax)12O19 0.01 < x < 0.1 solid solutions), and the main magnetic (coercivity, magnetization, anisotropy field and the first anisotropy constant) and microwave (resonant frequency and amplitude) characteristics of functional composites with 30 wt.% of hexaferrite. The paper presents a correlation between the chemical compositions of composites and amplitude–frequency characteristics. Increase of Ga-content from x = 0 to 0.1 in Ba(Fe1−xGax)12O19/epoxy composites leads to increase of the resonant frequency from 51 to 54 GHz and absorption amplitude from −1.5 to −10.5 dB/mm. The ability to control the electromagnetic properties in these types of composites opens great prospects for their practical applications due to high absorption efficiency, and lower cost in comparison with pure ceramics oxides.

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Section: Introductionmentioning

confidence: 99%

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

et al. 2019

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“…Barium hexaferrite powders are ideally suited fillers for the development of electromagnetic attenuation materials at microwave frequencies, due to their low cost, low density, high stability, large electrical resistivity, and high microwave magnetic loss. Thus, they find applications as electromagnetic emission absorber materials [7,8,9,10,11,12,13,14,15]. …”

Section: Introductionmentioning

confidence: 99%

Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques

et al. 2017

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Barium hexaferrite powder samples with grains in the μm-range were obtained from solid-state sintering, and crystals with sizes up to 5 mm grown from PbO, Na2CO3, and BaB2O4 fluxes, respectively. Carbonate and borate fluxes provide the largest and structurally best crystals at significantly lower growth temperatures of 1533 K compared to flux-free synthesis (1623 K). The maximum synthesis temperature can be further reduced by the application of PbO-containing fluxes (down to 1223 K upon use of 80 at % PbO), however, Pb-substituted crystals Ba1–xPbxFe12O19 with Pb contents in the range of 0.23(2) ≤ x ≤ 0.80(2) form, depending on growth temperature and flux PbO content. The degree of Pb-substitution has only a minor influence on unit cell and magnetic parameters, although the values for Curie temperature, saturation magnetization, as well as the coercivity of these samples are significantly reduced in comparison with those from samples obtained from the other fluxes. Due to the lowest level of impurities, the samples from carbonate flux show superior quality compared to materials obtained using other methods.

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“…Principally, low coercivity is suitable for various usage such as switching and sensing. Moreover, low coercivity is very essential for electromagnetic materials [16][17][18][19]. It is evident from Fig.…”

Section: -2-morphology Analysis Of Powdersmentioning

confidence: 99%

“…This matter confirms the significant role of the absorber thickness on the microwave absorption performance of the sample. The emergence of 3 matching frequencies in this situation could be explained by domains wallmotion (lower frequency), incoherent rotation of magnetization (higher frequency) and spin resonance (higher frequency)[5,16,[19][20][21].…”

mentioning

confidence: 99%

Novel approach for designing a thin and broadband microwave absorber in Ku band based on substituted M-hexaferrites

Afghahi

Jafarian

Atassi

2016

Journal of Magnetism and Magnetic Materials

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High-frequency Properties and Electromagnetic Wave Attenuation for Hexaferrite Composites

Cited by 6 publications

References 9 publications

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques

Novel approach for designing a thin and broadband microwave absorber in Ku band based on substituted M-hexaferrites

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