Microwave properties of composites with glass coated amorphous magnetic microwires

Starostenko, S. N.; Rozanov, Konstantin N.; Осипов, А. В.

doi:10.1016/j.jmmm.2005.03.004

Cited by 34 publications

(30 citation statements)

References 12 publications

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“…The composite prepared from magnetically soft glass-coated microwires embedded in an elastomeric matrix are promising for applications in electromagnetic shields (see Figures 9 and 10) [18][19][20][21][22][23][24][25]. Thus, 1-mm-thick shields are capable for attenuating of electromagnetic radiation in a frequency range of 3-16 GHz by 20-30 dB, which can be used in aircraft equipment operating in the super high frequency range, e.g., radar altimeters (4.3 GHz), microwave landing systems (5.0-5.1 GHz), Doppler navigation systems (8.8 GHz), and weather radars (9.375 GHz).…”

Section: Application Of Microwiresmentioning

confidence: 99%

Technology, Preparation and Properties of the Cast Glass-Coated Magnetic Microwires

Baranov

Larin

Torcunov³

2017

Crystals

130

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Magnetic properties of cast amorphous and nanocrystalline microwires have been reviewed considering their potential application. Microwires were produced from Co Fe Mn Cr Cu B and Si using the Taylor-Ulitovsky method. Technological aspects of the Taylor-Ulitovsky method for fabrication of glass-coated microwire with different structure are analyzed. Magnetic microwires demonstrate a large variety of magnetic behaviors, which is important for sensing applications. Depending on the chemical composition of the metallic core, for Co-, Fe-and Ni-based composition, the microwires' properties are very different. The geometrical characteristics (diameter of metallic core and thickness of the glass) of the microwire depend on the physical properties of a metallic composition and of glass and the parameters of the heating inductor and the speed of obtaining a microwire. The diameter of metallic core in these microwires can range from 0.5 to 70 µm, and their thickness of the glass can vary from 1 to 50 µm.

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Section: Application Of Microwiresmentioning

confidence: 99%

Technology, Preparation and Properties of the Cast Glass-Coated Magnetic Microwires

Baranov

Larin

Torcunov³

2017

Crystals

130

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“…The theory of permittivity control in composites filled with glass-coated microwires of permeable amorphous alloys is suggested in [8][9][10]. The idea is that the penetration depth (skin-depth) δ and consequently the surface impedance of a permeable wire depend at microwaves on both direct current (d.c.) conductivity and complex permeability µ.…”

Section: Introductionmentioning

confidence: 99%

“…It is not so because the composite is too diluted: even the anisotropic sample of closely packed sections of amorphous wire (the filling factor is as high as 0.7) exhibits microwave permeability that is close to unity [8]. The reason is that the magnetization perpendicular to wire axis is negligible due to high demagnetization factor.…”

Section: Introductionmentioning

confidence: 99%

“…Contrary to studies on response of a single wire [15][16][17], or lattice of thin continuous wires [15,18] we consider the practicable composites, namely the mats filled with wire sections. The absorption region of the composite is limited by the wire length within approximately 2 ÷ 30 GHz range as the long wires intertwine, while the properties of short ones are unstable [8,18]. The dielectric spectra of composites under study are more complicated than that of the samples with impermeable wires [13].…”

Section: Introductionmentioning

confidence: 99%

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Microwave Screen With Magnetically Controlled Attenuation

Starostenko¹,

Rozanov²

2009

PIER

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Abstract-The effect of magnetic bias on dielectric spectra of composite sheets filled with Fe or Co-based microwires is studied experimentally and via simulation. The permittivity is measured using a free-space technique within the frequency band from 6 to 12 GHz. The bias is applied either parallel or perpendicular to the microwave electric field; the bias strength varies from 0 to 2.5 kOe. The composites with Fe-based wires reveal a single region of bias dependent permittivity under bias about 800-1000 Oe. The composites with Cobased wires reveal two such regions: the high-field region is close to that of composites with Fe wires, and the low-field region corresponds to the coercive field of Co wires (2-3 Oe). The high-field effect is related to the dependence of ferromagnetic resonance (FMR) parameters on bias; the low-field effect is related to the rearrangement of the domain structure of Co-based wires. The interference of magnetoimpedance and dipole resonance is analyzed, revealing the effects off wire length, diameter, parameters of magnetic resonance and composite structure. The results are considered in view of application to the problem of controlled microwave attenuation. Simulation shows that the narrower is the FMR spectrum and the higher is the admissible loss of a sheet in a transparent state, the wider is the dynamic range of attenuation control. The attenuation range of a lattice of continuous wires is smaller than that of a screen with identical wire sections, where the magnetoimpedance effect is amplified resonantly. At 15 GHz frequency the strength of the bias switching opaque sheet with Fe-based wires to the transparent state is about 2000 Oe. For 3 dB admissible loss, the range of attenuation control about 10 dB is feasible in a composite with aligned wire sections. If the aligned sections are distributed regularly, the loss in a transparent state is about 1 dB lower.

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“…For metals the microwave permittivity ε is a function of electrical conductivity σ and frequency f : The penetration depth δ of permeable metals contrary to that of impermeable ones is not a monotonous function of frequency and depends on external bias [13]:…”

Section: Effect Of Eddy Currentsmentioning

confidence: 99%

The Study of Structure-Dependent Properties of Thin Magnetic Films at Microwaves by Field-Domain Resonance Technique

Starostenko¹,

Rozanov²

2009

PIER C

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Abstract-The strip-line frequency-domain technique for permeability measurement is compared to the field domain technique. The combined setup for microwave measurement of thin film permeability with both techniques is proposed. The field-domain technique is less affected by inhomogeneity of measurement strip cell and has significantly higher signal-to-noise ratio, but the obtained parameters are affected by film thickness and may differ from that of the frequency-domain technique. Analysis of the field-domain data obtained at a set of frequencies makes it possible to determine the saturation magnetisation, the anisotropy field and the damping factor without the knowledge of the amount of substance under study. In case of a simple permeability spectrum the data on metal thickness make it possible to estimate the effective skin-depth as well. The technique is tested by simulation and is applied to determine permeability of Fe-based films vacuum-sputtered on glassceramic and polymer substrates.

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Microwave properties of composites with glass coated amorphous magnetic microwires

Cited by 34 publications

References 12 publications

Technology, Preparation and Properties of the Cast Glass-Coated Magnetic Microwires

Technology, Preparation and Properties of the Cast Glass-Coated Magnetic Microwires

Microwave Screen With Magnetically Controlled Attenuation

The Study of Structure-Dependent Properties of Thin Magnetic Films at Microwaves by Field-Domain Resonance Technique

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