Millimeter-Wave Transmittance and Reflectance Measurement on Pure and Diluted Carbonyl Iron

Korolev, K.A.; Chen, Shu; Li, Zijing; Afsar, M.N.

doi:10.1109/tim.2009.2031851

Cited by 12 publications

(12 citation statements)

References 22 publications

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“…[9][10][11][12] Note that these measurements were performed on the pure barium hexaferrite powders. Present study presents the characterization of the frequency dependent La-Co substitutions studied by a free space transmittance millimeter wave spectrometer (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Tunable ferromagnetic resonance in La-Co substituted barium hexaferrites at millimeter wave frequencies

Korolev

Zhong

et al. 2018

AIP Advances

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Transmittance measurements have been performed on La-Co substituted barium hexaferrites in millimeter waves. Broadband millimeter-wave measurements have been carried out using the free space quasi-optical spectrometer, equipped with a set of high power backward wave oscillators covering the frequency range of 30 – 120 GHz. Strong absorption zones have been observed in the millimeter-wave transmittance spectra of all La-Co substituted barium hexaferrites due to the ferromagnetic resonance. Linear shift of ferromagnetic resonance frequency as functions of La-Co substitutions have been found. Real and imaginary parts of dielectric permittivity of La-Co substituted barium hexaferrites have been calculated using the analysis of recorded high precision transmittance spectra. Frequency dependences of magnetic permeability of La-Co substituted barium hexaferrites, as well as saturation magnetization and anisotropy field have been determined based on Schlömann’s theory for partially magnetized ferrites. La-Co substituted barium hexaferrites have been further investigated by DC magnetization to assess magnetic behavior and compare with millimeter wave data. Consistency of saturation magnetization determined independently by both millimeter wave absorption and DC magnetization have been found for all La-Co substituted barium hexaferrites. These materials seem to be quite promising as tunable millimeter wave absorbers, filters, circulators, based on the adjusting of their substitution parameters.

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Section: Resultsmentioning

confidence: 99%

Tunable ferromagnetic resonance in La-Co substituted barium hexaferrites at millimeter wave frequencies

Korolev

Zhong

et al. 2018

AIP Advances

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“…Free space millimeter wave quasi-optical spectroscopy technique, including technical details and measurement uncertainties analysis, has been successfully employed and presented by several researchers [4]- [7]. This study presents complex dielectric and magnetic measurements at millimeter waves performed by the free space quasi-optical spectrometer in transmittance mode [6], [7].…”

Section: B Quasi-optical Spectrometermentioning

confidence: 99%

“…This study presents complex dielectric and magnetic measurements at millimeter waves performed by the free space quasi-optical spectrometer in transmittance mode [6], [7]. Three high vacuum, high power backward wave oscillators (also called carcinotrons) (BWO) have been used as sources of coherent radiation continuously tunable in the range from 30 to 120 GHz.…”

Section: B Quasi-optical Spectrometermentioning

confidence: 99%

Microwave and Millimeter Wave Ferromagnetic Absorption of Nanoferrites

2012

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Complex dielectric permittivity and magnetic permeability of several commercially available nanoferrites have been studied over a broad microwave and millimeter wave frequency range. Nano-sized barium, strontium, copper, zinc, nickel substituted iron oxide powders with different lattice structures are investigated. A transmission-reflection based in-waveguide technique that employs a vector network analyzer was used to determine the scattering parameters for each sample in two microwave bands (18-40 GHz). A free space quasi-optical spectrometer energized by backward wave oscillators was used to acquire the transmittance spectra in the millimeter wave frequency range (30-120 GHz). Relatively broad and sharp ferromagnetic resonance of hexagonal barium ferrite and strontium ferrite are observed in millimeter wave frequency range. The ferromagnetic resonance peak for nano-sized hexagonal ferrite powder material moves to lower frequencies compared to micro-sized and solid hexagonal ferrites. An X-ray diffraction measurement is performed on these hexagonal ferrites to understand the magnetic behavior and the structure.

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“…Free space millimeter wave quasi-optical spectroscopy technique, including technical details and measurement uncertainties analysis, has been successfully employed and presented by several scientific groups: [5]- [8]. This study presents dielectric and magnetic millimeter wave measurements performed by the free space quasi-optical spectrometer in transmittance mode.…”

Section: Measurements Techniquementioning

confidence: 99%

“…Note, that in order to get better transmittance interferogram spectra, the errors can be significantly reduced by imposing the following restrictions on the sample dimensions D I12 2: 8.,1, and d :::; 3.,1, [5], [8]. Here, D and d are the cross section and thickness of a plane-parallel specimen, respectively.…”

Section: Measurements Techniquementioning

confidence: 99%

Ferromagnetic resonance in millimeter waves: Micro- and nanoferrites

Korolev

Afsar

2011

2011 IEEE MTT-S International Microwave Symposium

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Complex magnetic permeability and dielectric permittivity of micro-and nano-sized powdered barium ferrite (BaFeI2019) and strontium ferrite (SrFeI2019) have been studied in a broadband millimeter wave frequency range for the first time. Transmittance measurements have been performed using a free space quasi-optical millimeter wave spectrometer, equipped with a set of high power backward wave oscillators. Backward wave oscillators have been used as sources of tunable coherent radiation at each individual Q-, V-and W-frequency bands. Real and imaginary parts of dielectric permittivity for both types of micro-and nanoferrites have been calculated using analysis of recorded high precision transmittance spectra. Frequency dependences of the magnetic permeability have been obtained from SchlOmann's equation for partially magnetized ferrites.Tunable millimeter wave absorber, based on micro-and nano sized powdered ferrite materials is presented.Index Terms -Dielectric permittivity, ferrite materials, magnetic permeability, millimeter wave measurements.

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Millimeter-Wave Transmittance and Reflectance Measurement on Pure and Diluted Carbonyl Iron

Cited by 12 publications

References 22 publications

Tunable ferromagnetic resonance in La-Co substituted barium hexaferrites at millimeter wave frequencies

Tunable ferromagnetic resonance in La-Co substituted barium hexaferrites at millimeter wave frequencies

Microwave and Millimeter Wave Ferromagnetic Absorption of Nanoferrites

Ferromagnetic resonance in millimeter waves: Micro- and nanoferrites

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