Journal ArticleDOI
Magnetic and Dielectric Property Studies in Fe- and NiFe-Based Polymer Nanocomposites
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TLDR
In this paper, NiFe and Fe nanoparticles were dispersed in epoxy as nanocomposites, in different volume fractions, and the permittivity, permeability, and loss tangents of the composites were measured with an impedance analyzer and correlated with the magnetic properties of the particle such as saturation magnetization and field anisotropy.Abstract:
Metal–polymer composites were investigated for their microwave properties in the frequency range of 30–1000 MHz to assess their application as inductor cores and electromagnetic isolation shield structures. NiFe and Fe nanoparticles were dispersed in epoxy as nanocomposites, in different volume fractions. The permittivity, permeability, and loss tangents of the composites were measured with an impedance analyzer and correlated with the magnetic properties of the particle such as saturation magnetization and field anisotropy. Fe–epoxy showed lower magnetic permeability but improved frequency stability, compared to the NiFe–epoxy composites of the same volume loading. This is attributed to the differences in nanoparticle’s structure such as effective metal core size and particle-porosity distribution in the polymer matrix. The dielectric properties of the nanocomposites were also characterized from 30 MHz to 1000 MHz. The instabilities in the dielectric constant and loss tangent were related to the interfacial polarization relaxation of the particles and the dielectric relaxation of the surface oxides.read more
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Effect of Silane Modified E-glass Fibre/Iron(III)Oxide Reinforcements on UP Blended Epoxy Resin Hybrid Composite
TL;DR: In this article, an amino-silane treated e-glass fiber and iron(III)oxide particles were reinforced with UP/epoxy polymer blend to improve thermal and mechanical properties.
Journal ArticleDOI
The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)
TL;DR: In this article, two samples of the ferromagnetic alloy (FeCoZr) x (PbZrTiO 3 ) (100− x ) of similar metallic phase contents have been produced using ion-beam sputtering in the atmosphere of argon and oxygen.
Journal ArticleDOI
Effect of Temperature and Frequency on Microwave Shielding Behaviour of Functionalized Kenaf Fibre-Reinforced MWCNTs/Iron(III) Oxide Modified Epoxy Hybrid Composite
Abstract: A strong conductive and magnetically strengthened microwave shielding hybrid epoxy composite was prepared and analyzed. The principal aim of this research work was to prepare a high stable microwave shielding hybrid epoxy composite with surface modified MWCNTs and iron(III) oxide nano particles. The surface-modification on these reinforcements favour the composites been retained their magnetic and electrical conductivity even in elevated temperatures 100 °C and 200 °C and frequency up to 50 GHz. The kenaf fibre, MWCNTs and iron(III) oxide particles were surface-modified by APTMS for effective protection of reinforcements. The composites were prepared using hand layup method. The additions of silane-treated kenaf fibre and MWCNTs with iron(III) oxide into epoxy resin improved the mechanical properties, the same has been discussed in the previous article by the author. The silane surface-modified composites gave unaltered dielectric constant and microwave shielding behaviour in elevated temperatures. The acquisition of residual magnetism remains same as room temperature and 200 °C. The maximum relative magnetic permeability of 1.2 and dielectric constant of 4.0 was observed for composite designation ‘E’ in room temperature. Similarly maximum EM wave attenuation of 44 dB was achieved in J band frequency at 200 °C. These high stable microwave shielding composite materials are capable of serving as shielding materials in electronic communication gadgets, radar and microwave shielding helmets.
Journal ArticleDOI
Role of silanized magnetic Fe2O3 particle in heat dissipation and microwave shielding behavior of E-glass fibre-reinforced epoxy resin composite
Journal ArticleDOI
Machine-Learning Approach for Design of Nanomagnetic-Based Antennas
TL;DR: It is shown that machine-learning techniques can be efficiently used to characterize nanomagnetic-based antennas by accurately mapping the particle radius and volume fraction of the nanom magnetic material to antenna parameters such as gain, bandwidth, radiation efficiency, and resonant frequency.
References
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Journal Article
On the Theory of Ferromagnetic Resonance Absorption
TL;DR: The theory of ferromagnetic resonance absorption was extended in this paper to include the effect of the shape of the specimen and, in the case of a single crystal, of crystal orientation.
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Exchange anisotropy — a review
Ami E. Berkowitz,Kentaro Takano +1 more
TL;DR: In this article, the unidirectional anisotropy of a ferromagnetic bilayer coupled to an antiferromagnetic film was studied. But the authors focused on the unideal anismotropy produced by the exchange bias field produced by a metal and an oxide bilayer.
Journal ArticleDOI
Experimental trends in polymer nanocomposites—a review
TL;DR: A review of the recent work on polymer matrix nanocomposites is presented in this paper, where a number of composite systems with amorphous and/or crystalline polymer matrices and different nano-sized filler materials are discussed.
Journal ArticleDOI
Dispersion and absorption in magnetic ferrites at frequencies above one Mc/s
TL;DR: In this paper, the absorption and dispersion observed in magnetic ferrites at frequencies above one Mc/s are discussed making the assumption that at these frequencies no contribution to the magnetisation is made by the Bloch boundaries.
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Soft magnetic composite materials (SMCs)
H. Shokrollahi,Kamal Janghorban +1 more
TL;DR: A review of the magnetic properties, characteristics, processing and applications of soft magnetic composite materials is presented in this paper, where the authors describe soft magnetic composites (SMCs) as ferromagnetic powder particles surrounded by an electrical insulating film.