Demonstration of anisotropic composites with tuneable microwave permeability manufactured from ferromagnetic thin films

Acher, O.; Gourrierec, P Le; Perrin, Guillaume; Baclet, P.; Roblin, O.

doi:10.1109/22.493920

Cited by 30 publications

(10 citation statements)

References 14 publications

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“…Such composite materials have a high saturation magnetization and a low electrical conductivity. 7 In comparison with ferrites, ferromagnetic composites represent a low-cost substitute technology for tunable microwave circuits requiring lower external magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Correlation between magnetic properties of layered ferromagnetic/dielectric material and tunable microwave device applications

Salahun

Quéffélec

Tanné

et al. 2002

Journal of Applied Physics

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Analysis of the mode composition of an X-band overmoded O-type Cerenkov high-power microwave oscillator Phys. Plasmas 19, 103102 (2012) Gap independent coupling into parallel plate terahertz waveguides using cylindrical horn antennas J. Appl. Phys. 112, 073102 (2012) A band-pass filter approach within molecular dynamics for the prediction of intrinsic quality factors of nanoresonators J. Appl. Phys. 112, 074301 (2012) A research of W-band folded waveguide traveling wave tube with elliptical sheet electron beam Phys. Plasmas 19, 093117 (2012) Dual-band terahertz metamaterials based on nested split ring resonators Layered dielectric / ferromagnetic materials are extensively explored for microwave applications. Indeed, these materials combine the large saturation magnetization of ferromagnetic material with the low loss of dielectrics. Here, our aim was to integrate a layered ferromagnetic composite in a microwave propagation structure since the main advantage of such a material is the large impedance for one polarization. Thus, in order to predict the transmission response of the device, we carried out an electromagnetic analysis to determine how the field pattern of a microstrip line and the microwave-induced demagnetizing fields disturb the material behavior. We also explored the use of the propagation structure in two dc magnetic field-dependent devices: a tunable band stop filter and a magnetic switch. The stop-band function presented a large tunability of more than 50% with a minimal insertion loss of 3 dB when 250 Oe field was applied. Moreover, a magnetic switch using a dc field perpendicular to the easy axis of the ferromagnetic material was manufactured.

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Section: Introductionmentioning

confidence: 99%

Correlation between magnetic properties of layered ferromagnetic/dielectric material and tunable microwave device applications

Salahun

Quéffélec

Tanné

et al. 2002

Journal of Applied Physics

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“…On that account, magnetic alloy composites for microwave applications are compelled to be in the form of thin film to suppress the eddy current loss originating from their low resistance [1]. Furthermore, the film surface is occasionally patterned to suppress the in-plane eddy current by introducing in-plane anisotropy [2]- [4]. The state-of-the-art deposition techniques make it possible to fabricate such patterned multilayer film in small and flexible forms suitable for conformal installation on curved hull or radome.…”

Section: Introductionmentioning

confidence: 99%

Permittivity and Permeability Measurements of a Thin Film With Patterned Anisotropy at Microwave Frequencies

Chung

2015

IEEE Trans. Magn.

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We propose a measurement technique to retrieve the constitutive parameters of a magnetic alloy composite in the form of thin film. Frequency of interest is 0.5 MHz-2.5 GHz, and the sample under test is patterned along the hard axis exhibiting in-plane anisotropy. To measure both the in-plane permittivity and permeability of the film, we prepare two separate planar transmission line fixtures, and then collect the transmission coefficient with the sample inserted in the fixtures. The in-plane permittivity and permeability are extracted from the transmission coefficient using a two-step retrieval process, namely, calculating the effective parameters out from the transmission coefficient and calculating the sample parameters out from the effective parameters. The latter is implemented by means of curve fitting a set of full-wave simulation data, instead of conventional quasi-static analyses, enabling broadband characterization in the microwave frequency range.Index Terms-Microstrip circuits, microwave measurements, permeability measurement, permittivity measurement, thin films.

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“…In these applications, ferromagnetic thin films are appreciated as high permeability materials [1] . In microwave frequency range, the permeability and the conductivity are important material parameters, which determine the application characteristics of the thin film, so they must be measured in a convenient and reliable way.…”

Section: Introductionmentioning

confidence: 99%

“…At a given frequency, the conductivity can be expressed as 11 ( , ) f S d σ = (1) where ı and d are the conductivity and the thickness of the thin film, respectively, and |S 11 | is the magnitude of the reflection coefficient. In this paper, this function is established by using SVR technique.…”

Section: Introductionmentioning

confidence: 99%

Extracting the conductivity of ferromagnetic thin films by using support vector regression

Tang

et al. 2010

2010 International Conference on Microwave and Millimeter Wave Technology

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A new method based on support vector regression (SVR) is proposed to extract the conductivity of the ferromagnetic thin films in this paper. First, the conductivity function with the thickness of the thin films and the reflection coefficients of the network is constructed by SVR based on 3D electromagnetic (EM) simulation data. Then, the reflection coefficients of the network under test are measured by vector network analyzer. At last, the conductivities of the ferromagnetic thin film are extracted by using the established SVR model from the measured reflection coefficients. The experimental results show that, using the method proposed in this paper, the conductivity of the thin films can be extracted accurately from 100 MHz to 10 GHz.

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Demonstration of anisotropic composites with tuneable microwave permeability manufactured from ferromagnetic thin films

Cited by 30 publications

References 14 publications

Correlation between magnetic properties of layered ferromagnetic/dielectric material and tunable microwave device applications

Correlation between magnetic properties of layered ferromagnetic/dielectric material and tunable microwave device applications

Permittivity and Permeability Measurements of a Thin Film With Patterned Anisotropy at Microwave Frequencies

Extracting the conductivity of ferromagnetic thin films by using support vector regression

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