New method for determining the permeability tensor of magnetized ferrites in a wide frequency range

Quéffélec, Patrick; Floc’h, M. Le; Gelin, Philippe

doi:10.1109/22.859479

Cited by 53 publications

(33 citation statements)

References 12 publications

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“…This is well known for isotropic materials [2,3,12,20], bi-isotropic (chiral) materials [9,17], and even anisotropic materials where an optical axis is along the waveguide axis [1,10,15,16], but for general bianisotropic media with arbitrary axes there are so far very few results available. In principle, an optimization approach as in [12] and [16] can be designed, where the material parameters are found by minimizing the distance between measured and simulated S-parameters. However, this method is typically plagued by non-uniqueness and similar numerical issues, and we seek a more direct method, providing physical insight to the problem.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Propagation Constants and Material Data From Waveguide Measurements

Sjöberg¹

2009

PIER B

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Abstract-This paper presents an analysis with the aim of characterizing the electromagnetic properties of an arbitrary linear, bianisotropic material inside a metallic waveguide. The result is that if the number of propagating modes is the same inside and outside the material under test, it is possible to determine the propagation constants of the modes inside the material by using scattering data from two samples with different lengths. Some information can also be obtained on the cross-sectional shape of the modes, but it remains an open question if this information can be used to characterize the material. The method is illustrated by numerical examples, determining the complex permittivity for lossy isotropic and anisotropic materials.

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Section: Introductionmentioning

confidence: 99%

“…This is ensured by the following procedure. Fix z = 0 in expansions (16) and (17), multiply each expansion with…”

Section: The Forward Scattering Problemmentioning

confidence: 99%

Determination of Propagation Constants and Material Data From Waveguide Measurements

Sjöberg¹

2009

PIER B

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“…For x=0.0, it exhibits 4πM s =3.78 kGs, and H a =17.6 kOe, which is similar to previously reported from bulk barium and strontium hexaferrite materials. 18,19 Furthermore, a higher LaCo concentrations leads to increasing magnetocrystalline anisotropy H a and otherwise lower saturation magnetization 4πM s . Such enhancements in H a could result in the shifting of observing FMR to higher frequencies.…”

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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“…The electromagnetic behavior of a filled waveguide with a magnetized ferrite is generally very complex [6,7]. A magnetically polarized material with a static magnetic In an magnetized sample with infinity dimensions, depending on the propagation configuration, one can define three types of effective magnetic permeability: 1) propagation parallel to the external magnetic field, …”

Section: Theorymentioning

confidence: 99%

Estimation of permeability tensor and dielectric permittivity of ferrites using a wave guide method under a dc magnetic field

Tsiachristos

Varouti

Manios

et al. 2014

EPJ Web of Conferences

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Abstract. Using a vector network analyzer equipped with a calibrated rectangular wave guide the electric permittivity and the element of the magnetic permeability tensor for Y3Fe5O12, ZnFe2O4 and NiFe2O4 are measured. The electric permittivity can be estimated from the body resonances (݀ = ݊ߣ/2 ) if a sufficient long sample is used. The estimation of the magnetic permeability tensors' parameters can be estimated comparing the experimental results with computer simulations using the magnetic properties of the materials as derived from the magnetic measurements.

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New method for determining the permeability tensor of magnetized ferrites in a wide frequency range

Cited by 53 publications

References 12 publications

Determination of Propagation Constants and Material Data From Waveguide Measurements

Determination of Propagation Constants and Material Data From Waveguide Measurements

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

Estimation of permeability tensor and dielectric permittivity of ferrites using a wave guide method under a dc magnetic field

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