Transmission, Reflection and Dissipation of Microwaves in Magnetic Composites with Nanocrystalline Finemet-Type Flakes

Ринкевич, А. Б.; Перов, Д. В.; Ryabkov, Yuriy I.

doi:10.3390/ma14133499

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…In order to calculate the transmission and reflection coefficients, according to the Formulas (27) and (28), it is necessary to know the dielectric permittivity of the samples. The samples used in this paper are the same as in [ 29 ] and we take the values of permittivity from that work. The mean values of the dielectric permittivity for the three frequency ranges and the values of the microwave conductivity for the composite with 15% flakes are presented in Table 1 .…”

Section: Discussionmentioning

confidence: 99%

Ferromagnetic Resonance and Antiresonance in Composite Medium with Flakes of Finemet-Like Alloy

Перов

Ринкевич

2021

Nanomaterials

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Propagation of microwaves is studied in a composite material containing flakes of Fe-Si-Nb-Cu-B alloy placed into an epoxyamine matrix. The theory is worked out, which permits to calculate the coefficients of the dynamic magnetic permeability tensor and the effective magnetic permeability of the transversely magnetized composite. The measurements of magnetic field dependences of the transmission and reflection coefficients were carried out at frequencies from 12 to 38 GHz. Comparison between calculated and measured coefficients were conducted, which show that the calculation reproduces all main features of the resonance variations caused by ferromagnetic resonance and antiresonance. The dissipation of microwave power was calculated and measured. It is shown that the penetration depth of the electromagnetic field increases under antiresonance condition and decreases under resonance.

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Section: Discussionmentioning

confidence: 99%

Ferromagnetic Resonance and Antiresonance in Composite Medium with Flakes of Finemet-Like Alloy

Перов

Ринкевич

2021

Nanomaterials

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“…The microwave conductivity of the composites is low, approximately 2 S/m. The microwave magnetic permeability of a composite with 15% flakes at H = 0 was studied in [6]. It was found there that in the frequency range under consideration, the real part of the magnetic permeability does not exceed 1.04, and the imaginary part is less than 0.1.…”

Section: mentioning

confidence: 99%

“…Microwave absorption, magnetic permeability and dielectric permittivity of a composite containing Finemet type alloy flakes in an epoxyamine matrix were studied in [6]. The microwave magnetic permeability in this composite under the application of an external magnetic field was studied in [7].…”

Section: Introductionmentioning

confidence: 99%

The Microwave Absorption in Composites with Finemet Alloy Particles and Carbon Nanotubes

et al. 2022

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The absorption of waves of the centimeter and millimeter wavebands in composites with Finemet alloy particles and carbon nanotubes has been studied. It has been established that ferromagnetic resonance and antiresonance are observed in such composites. A method is proposed for calculating the effective dynamic magnetic permeability of a composite containing both a random distribution of ferromagnetic particles and a part of the particles oriented in the same way. In the approximation of effective parameters, the dependences of the transmission and reflection coefficients of microwaves are calculated. It is shown that the theoretical calculation confirms the existence of resonant features of these dependences caused by ferromagnetic resonance and antiresonance. The theory based on the introduction of effective parameters satisfactorily describes the course of the field dependence of the coefficients and the presence of resonance features in these dependences. The frequency dependence of the complex permittivity of the composite is determined. The dependence of the complex magnetic permeability on the magnetic field for millimeter-wave frequencies is calculated.

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“…The reflection and transmission coefficients were measured, and the dielectric properties were calculated from the experimentally obtained frequency dependences. Formulas for reflection and transmission of the dielectric waveguide plug can be found in [15]. The scheme of the mea-surement is shown in Figure 1a.…”

Section: Characterization Of Dielectric Properties Of Plastics Materials For 3d Printingmentioning

confidence: 99%

Study of 3D-Printed Dielectric Barrier Windows for Microwave Applications

et al. 2021

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3D printing technologies offer significant advantages over conventional manufacturing technologies for objects with complicated shapes. This technology provides the potential to easily manufacture barrier windows with a low reflection in a wide frequency band. Several 3D printing methods were examined for this purpose, and the dielectric properties of the various types of materials used for 3D printing were experimentally studied in the frequency range 26–190 GHz. These measurements show that the styrene-butadiene-styrene and polyamide plastics are suitable for broadband low-reflection windows for low-to-medium-power microwave applications. Two barrier windows with optimized surface shapes were printed and tested. Results demonstrate that the studied technique can fabricate windows with a reflection level below −18 dB in the frequency band up to 160 GHz. Studied windows can be used for spectroscopic tasks and other wideband microwave applications.

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Transmission, Reflection and Dissipation of Microwaves in Magnetic Composites with Nanocrystalline Finemet-Type Flakes

Cited by 8 publications

References 27 publications

Ferromagnetic Resonance and Antiresonance in Composite Medium with Flakes of Finemet-Like Alloy

Ferromagnetic Resonance and Antiresonance in Composite Medium with Flakes of Finemet-Like Alloy

The Microwave Absorption in Composites with Finemet Alloy Particles and Carbon Nanotubes

Study of 3D-Printed Dielectric Barrier Windows for Microwave Applications

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