Microwave absorbing properties of ferrite-based nanocomposites

Jänis, A.; Olsson, Richard T.; Savage, S. J.; Gedde, Ulf W.; Klement, Uta

doi:10.1117/12.714714

Cited by 8 publications

(7 citation statements)

References 4 publications

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“…Small differences in permeability can even affect the microwave absorption properties of the materials [41]. It will be seen later that the magnetic characteristics contributed well to the RL values in Figure 12. (a) Figure 11.…”

Section: Electromagnetic Constitutive Parametersmentioning

confidence: 69%

“…Magnetic losses are more effective and sensitive than dielectric losses for microwave absorption. A small differences in permeability can even affect the microwave absorption properties of the materials [41]. Figures 9 and 10 show the real and the imaginary parts of the relative permittivity and permeability of five different compositions of Mn or Zn ferrite and MWCNTs alloys, namely in 25% increments of weight ratios.…”

Section: Electromagnetic Constitutive Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

et al. 2017

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Magnetic and dielectric materials can be blended to enhance absorption properties at microwave frequencies, although the materials may have relatively weak attenuation capabilities by themselves. The specific goal of this work is to enhance microwave absorption properties of materials with interesting dielectric behavior by blending them with magnetic materials based on transition metals. The synthesized Mn 1−x Zn x Fe 2 O 4 (x = 0.0 and 1.0) spinel ferrite nanoparticles (MZF NPs) were blended with commercial multi-walled carbon nanotubes (MWCNTs) in various proportions with a binder matrix of paraffin. This simple and efficient process did not cause a significant variation in the energy states of MWCNTs. MZF NPs were synthesized with a citric acid assisted sol-gel method. Their electromagnetic characteristics and microwave absorption properties were investigated. These properties were derived from the microwave scattering parameters measured via the transmission line technique by using a vector network analyzer (VNA) in conjunction with an X band waveguide system. The return loss (RL) values of the samples were obtained from the electromagnetic constitutive parameters (permittivity and permeability). The results indicate that the minimum RL value and the bandwidth change significantly with the amount of ferrite material in the blend. These results encourage further development of MWCNTs blended with ferrite nanoparticles for broadband microwave applications.

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Section: Electromagnetic Constitutive Parametersmentioning

confidence: 69%

Section: Electromagnetic Constitutive Parametersmentioning

confidence: 99%

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

et al. 2017

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“…The first sam- ple is a dielectric polymer made of epoxy, diglycidyl ether bisphenol-A, which is opaque in the IR range. The second sample is a ferrite-based polymer nanocomposite where epoxy is used as matrix material and cobolt-ferrite nanoparticles [1] as filler with a volume fraction of 10 vol%. This sample is opaque in the VIS and IR ranges.…”

Section: Experimental 21 Samplesmentioning

confidence: 99%

Spectroscopic ellipsometry and vector network analysis for determination of the electromagnetic response in two wavelength regions

Åkerlind¹,

Jänis²,

Kariis³

et al. 2008

Phys. Status Solidi (c)

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In this work, spectroscopic ellipsometry and vector network analysis are used to determine the electromagnetic response of three samples, an epoxy polymer, a sample with ferrit‐based nanoparticles in a polymer matrix and silicon, in the wavelength ranges 0.4‐30 μm and 0.75‐7.59 cm. Both methods measure amplitude and phase changes due to interaction with a sample and can be used to measure the full complex‐valued dielectric response to electromagnetic radiation. The data from the two methods show similar levels of the response at the two ends of the spectral gap between the ranges of the two methods. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…Magnetoplastics are highly commercially attractive for creating various parts, electronic elements, and devices with semi-hard magnetic properties due to their low processing costs, the ability to create flexible and stretchable pieces, parts with complex shapes, corrosion resistance, etc. Furthermore, the magnetic nanopowders are excellent electromagnetic wave absorbers due to their high surface area [19][20][21]. Radio-absorbing materials are used for the electromagnetic compatibility of electronic devices, protection of computer information processing systems from unauthorized access, protection of biological objects from electromagnetic radiation, etc.…”

Section: Introductionmentioning

confidence: 99%

Impact of Iron on the Fe–Co–Ni Ternary Nanocomposites Structural and Magnetic Features Obtained via Chemical Precipitation Followed by Reduction Process for Various Magnetically Coupled Devices Applications

et al. 2021

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This paper presents the synthesis of Fe–Co–Ni nanocomposites by chemical precipitation, followed by a reduction process. It was found that the influence of the chemical composition and reduction temperature greatly alters the phase formation, its structures, particle size distribution, and magnetic properties of Fe–Co–Ni nanocomposites. The initial hydroxides of Fe–Co–Ni combinations were prepared by the co-precipitation method from nitrate precursors and precipitated using alkali. The reduction process was carried out by hydrogen in the temperature range of 300–500 °C under isothermal conditions. The nanocomposites had metallic and intermetallic phases with different lattice parameter values due to the increase in Fe content. In this paper, we showed that the values of the magnetic parameters of nanocomposites can be controlled in the ranges of MS = 7.6–192.5 Am2/kg, Mr = 0.4–39.7 Am2/kg, Mr/Ms = 0.02–0.32, and HcM = 4.72–60.68 kA/m by regulating the composition and reduction temperature of the Fe–Co–Ni composites. Due to the reduction process, drastic variations in the magnetic features result from the intermetallic and metallic face formation. The variation in magnetic characteristics is guided by the reduction degree, particle size growth, and crystallinity enhancement. Moreover, the reduction of the surface spins fraction of the nanocomposites under their growth induced an increase in the saturation magnetization. This is the first report where the influence of Fe content on the Fe–Co–Ni ternary system phase content and magnetic properties was evaluated. The Fe–Co–Ni ternary nanocomposites obtained by co-precipitation, followed by the hydrogen reduction led to the formation of better magnetic materials for various magnetically coupled device applications.

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Microwave absorbing properties of ferrite-based nanocomposites

Cited by 8 publications

References 4 publications

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

Spectroscopic ellipsometry and vector network analysis for determination of the electromagnetic response in two wavelength regions

Impact of Iron on the Fe–Co–Ni Ternary Nanocomposites Structural and Magnetic Features Obtained via Chemical Precipitation Followed by Reduction Process for Various Magnetically Coupled Devices Applications

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