Experimental determination of magnetocrystalline anisotropy constants and saturation magnetostriction constants of NiZn and NiZnCo ferrites intended to be used for antennas miniaturization

Mattéi, Jean-Luc; Guen, Emmanuel Le; Chevalier, Alexis; Tarot, Anne-Claude

doi:10.1016/j.jmmm.2014.09.026

Cited by 42 publications

(12 citation statements)

References 45 publications

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“…Therefore, the magnetization falls at a certain value of Zn concentration. This value is in between those of the samples with x ¼ 0:4 and x ¼ 0: 5,20 which is much higher than the levels in our present study. It is also known that the introduction of Zn in NiFe 2 O 4 reduces the magnetocrystalline anisotropy, which results in a reduction in coercivity, thus leading to high permeability.…”

Section: Discussioncontrasting

confidence: 78%

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Optimization of Ni0.95−xZn_xCo0.05Fe1.90Mn0.02O₄ ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Xiao

Wang

Liu³

et al. 2018

J. Adv. Dielect.

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O 4 (with x ¼ 0-0.20 at an interval of 0.05) ferrite ceramics were studied, in order to develop magneto-dielectric materials with almost equal values of relative permeability and permittivity, for the miniaturization of HF (3-30 MHz) and VHF (30-90 MHz and 100-300 MHz) antennas. The ferrite ceramics were prepared by using the conventional two-step sintering process. The real part of relative permeability is increased almost linearly with increasing concentration of Zn, while that of relative permittivity keeps nearly unchanged. It is found that promising magneto-dielectric materials, with close values of real permeability and permittivity over 30-90 MHz (VHF), can be obtained for the samples at Zn concentrations between x ¼ 0:05 and x ¼ 0:10.

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Section: Discussioncontrasting

confidence: 78%

“…On the other hand, due to the decreased magnetocrystalline anisotropy, the natural resonance frequency decreases with Zn concentration. 20 Therefore, it is expected that magnetic permeability of the …”

Section: Discussionmentioning

confidence: 99%

Optimization of Ni0.95−xZn_xCo0.05Fe1.90Mn0.02O₄ ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Xiao

Wang

Liu³

et al. 2018

J. Adv. Dielect.

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“…The electric tand e and magnetic tand m loss tangents defined in Eqs. (6) And (7) are often used [29,30].…”

Section: Measurement Methods and Its Theoretical Basismentioning

confidence: 99%

Increasing microwave absorption efficiency in ferrite based materials by doping with lead and forming composites

Liu

Drew

et al. 2015

Materials Chemistry and Physics

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“…The critical size of a monomagnetic‐domain is estimated using the following equation

D_{normalm} = \frac{9 σ_{normalw}}{2 π M_{normals}^{2}}

where

σ_{normalw} = \sqrt{2 k_{normalB} T_{normalC} | K_{1} | / a}

is the wall density energy, | K 1 | is the magnetocrystalline anisotropy constant, T C is the Curie temperature, k B is the Boltzmann constant, and a is the lattice constant. For a flexible NiZn‐ferrite layer annealed at 950 °C, M s = 412.14 emu cc −1 , T C = 475 K, a = 8.412 × 10 −8 cm (obtained from XRD data in Figure a), and | K 1 | = 2.7 × 10 4 erg cm− 3 . The critical size of the monomagnetic‐domain ( D m ) was calculated to be 17.3 nm, which is smaller than the grain size obtained from XRD data.…”

Section: Resultsmentioning

confidence: 99%

Fully‐Inkjet‐Printed Ag‐Coil/NiZn‐Ferrite for Flexible Wireless Power Transfer Module: Rigid Sintered Ceramic Body into Flexible Form

Bissannagari

Lee

Lee³

et al. 2017

Adv Funct Materials

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Despite the material performances being superior to those of organic materials, inorganic materials are typically excluded for use in flexible and deformable electronic systems because of their rigid nature and the requirement for high processing temperature. This work presents a novel method of utilizing rigid NiZn-ferrite films in a flexible platform and offers an opportunity to realize a flexible wireless power transfer (WPT) module. Inkjet printing is introduced in this study since it can coat NiZn-ferrite films as well as pattern inductor coils for WPTs. A thermochemically inert buffer layer is selected based on a thermodynamic analysis and is introduced as a buffer layer for the NiZn-ferrite to prevent chemical reaction between the ferrite film and the substrate and ensure that the ferrite film can be easily separated from the substrate during a high-temperature sintering process. A Ag-inductor coil is printed on the NiZn-ferrite layer, and then the entire layer is embedded into polydimethylsiloxane, which renders the WPT module flexible. The flexibility of the WPT module is characterized by a bending test, and the structural and magnetic properties are also investigated. The performance of the flexi ble WPT module is demonstrated by transmitting wireless power to a light emitting diode.

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Experimental determination of magnetocrystalline anisotropy constants and saturation magnetostriction constants of NiZn and NiZnCo ferrites intended to be used for antennas miniaturization

Cited by 42 publications

References 45 publications

Optimization of Ni0.95−xZn_xCo0.05Fe1.90Mn0.02O₄ ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Optimization of Ni0.95−xZn_xCo0.05Fe1.90Mn0.02O₄ ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Increasing microwave absorption efficiency in ferrite based materials by doping with lead and forming composites

Fully‐Inkjet‐Printed Ag‐Coil/NiZn‐Ferrite for Flexible Wireless Power Transfer Module: Rigid Sintered Ceramic Body into Flexible Form

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Experimental determination of magnetocrystalline anisotropy constants and saturation magnetostriction constants of NiZn and NiZnCo ferrites intended to be used for antennas miniaturization

Cited by 42 publications

References 45 publications

Optimization of Ni0.95−xZnxCo0.05Fe1.90Mn0.02O4 ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Optimization of Ni0.95−xZnxCo0.05Fe1.90Mn0.02O4 ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Increasing microwave absorption efficiency in ferrite based materials by doping with lead and forming composites

Fully‐Inkjet‐Printed Ag‐Coil/NiZn‐Ferrite for Flexible Wireless Power Transfer Module: Rigid Sintered Ceramic Body into Flexible Form

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Optimization of Ni0.95−xZn_xCo0.05Fe1.90Mn0.02O₄ ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

Optimization of Ni0.95−xZn_xCo0.05Fe1.90Mn0.02O₄ ceramics with promising magneto-dielectric properties for VHF antenna miniaturization