Electrical and Magnetic Properties of the Binary Heterogeneous Mixture Model

Starostenko, S. N.; Rozanov, Konstantin N.; Lagarkov, A. N.

doi:10.1134/s0031918x21040104

Cited by 3 publications

(8 citation statements)

References 51 publications

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“…The measured dependence of complex susceptibility on frequency and temperature for the paraffin-based composite filled with 30% vol of Gd powder (p incl = 0.3) is presented in Figure 4. The shape distribution may be described accurately with a Bergman-Milton geometrical spectral function [10], but its determination is a separate task falling out of the research scope, while the accuracy of fitting with Equation ( 3) is enough to estimate the effect of temperature on reflection and transmission spectra of a microwave screen.…”

Section: Measurement Results and Fitting Of The Obtained Datamentioning

confidence: 99%

“…The shape distribution may be described accurately with a Bergman-Milton geometrical spectral function [10], but its determination is a separate task falling out of the research scope, while the accuracy of fitting with Equation ( 3) is enough to estimate the effect of temperature on reflection and transmission spectra of a microwave screen.…”

Section: Measurement Results and Fitting Of The Obtained Datamentioning

confidence: 99%

“…The extrapolation is performed with a simplest mixing model unverified for the composite under study, the model does not account for effects related to structure changes in the composite with increase of filling factor (percolation, inversion of matrix structure, etc. [10]) and for the possible difference in magnetization of bulk metal and that of micrometer size grinded particles. Nevertheless, the estimated susceptibility appears to be close to the data retrieved from the published magnetization curves (Figure 1).…”

Section: Measurement Results and Fitting Of The Obtained Datamentioning

confidence: 99%

“…Here M is the sample magnetization for the strength of magnetic bias H, N is the demagnetization factor (the shape factor) defined by sample shape, and orientation is relative to bias direction [6,7]. The shape factor range is 0 ≤ N ≤ 1, for spheres N = 1/3 [9,10].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Temperature on Microwave Permeability of an Air-Stable Composite Filled with Gadolinium Powder

Starostenko

Petrov

Rozanov

et al. 2022

Sensors

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A composite containing about 30% volume of micrometer-size powder of gadolinium in paraffin wax is synthesized mechanochemically. The composite permittivity and permeability are measured within the frequency range from 0.01 to 15 GHz and the temperature range from ~0 °C to 35 °C. The permittivity is constant within the measured ranges. Curie temperature of the composite is close to 15.5 °C, the phase transition is shown to take place within a temperature range about ±10 °C. The effect of temperature deviation from Curie point on reflection and transmission of a composite layer filled with Gd powder is studied experimentally and via simulation. Constitutive parameters of the composite are measured in cooled coaxial lines applying reflection-transmission and open-circuit-short-circuit techniques, and the measured low-frequency permeability is in agreement with the values retrieved from the published magnetization curves. The effect of temperature on permeability spectrum of the composite is described in terms of cluster magnetization model based on the Wiener mixing formula. The model is applied to design a microwave screen with variable attenuation; the reflectivity attenuation of 4.5 mm-thick screen increases from about −2 dB to −20 dB at 3.5 GHz if the temperature decreases from 25 °C to 5 °C.

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Section: Measurement Results and Fitting Of The Obtained Datamentioning

confidence: 99%

Section: Measurement Results and Fitting Of The Obtained Datamentioning

confidence: 99%

Section: Measurement Results and Fitting Of The Obtained Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Temperature on Microwave Permeability of an Air-Stable Composite Filled with Gadolinium Powder

Starostenko

Petrov

Rozanov

et al. 2022

Sensors

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“…In addition, it is frequently observed in practices that the spectrum of permeability (μ″(f)) has a broad peak, especially for a magnetic composite with inhomogeneous magnetic structures and material microstructures [6,7]. For magnetic composites, there are many proposed effective medium laws to retrieve the intrinsic permeability spectra from the data of composites made of magnetic particles (flakes commonly seen) and non magnetic matrix (for instance, polymers) [6]. Usually, a broad intrinsic permeability spectrum can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic high frequency permeability of magnetic nanocomposites: uncertainty principle

Han

2024

Nanotechnology

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The intrinsic high frequency permeability spectra of ferromagnetic conductive nanocomposites containing different volume fractions of nanoscale iron and cobalt have been simulated. A law is proposed to explain the simulated results by assuming that there are plenty of LLG (Landau-Lifshitz-Gilbert) type natural resonances contributing to the intrinsic permeability spectra. The results clearly show that the spectra strongly depend on the distribution of local effective magnetic field, the interaction between the magnetic particles, the inhomogeneous damping constant of LLG precession, and the initial equilibrium states. Especially, the effect of particles shape distribution in each sampling on the local effective magnetic field. In view of this fact: it is absolutely impossible to have the same effect from these factors when someone prepares several measurement samples, an uncertainty principle is believed to hold for measuring the intrinsic permeability of an electromagnetic (EM) composite. Therefore, this law tells us that it should be cautious when comparing or evaluating the EM properties of composites (for instance, EM wave absorbing composites). Memory effect can be used to restore the intrinsic high frequency permeability for a specific defunct composite sample.

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Dynamic Permeability of Composite Media with Nonspherical Ferromagnetic Particles

Перов

Ринкевич

2022

Phys. Metals Metallogr.

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Electrical and Magnetic Properties of the Binary Heterogeneous Mixture Model

Cited by 3 publications

References 51 publications

Effect of Temperature on Microwave Permeability of an Air-Stable Composite Filled with Gadolinium Powder

Effect of Temperature on Microwave Permeability of an Air-Stable Composite Filled with Gadolinium Powder

Intrinsic high frequency permeability of magnetic nanocomposites: uncertainty principle

Dynamic Permeability of Composite Media with Nonspherical Ferromagnetic Particles

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