Rachit Pandey; Manoj Gupta
Abstract
The rapid progress in the expanse of electromagnetic devices among the broad scale of industrial, military, commercial and consumer sector has led to a surge in electromagnetic interference which has now become the fourth most prevalent category of pollution. Thus, there is a dire need of developing ...
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The rapid progress in the expanse of electromagnetic devices among the broad scale of industrial, military, commercial and consumer sector has led to a surge in electromagnetic interference which has now become the fourth most prevalent category of pollution. Thus, there is a dire need of developing materials which can shield the devices of its adverse effects. This review sets foot into what so far has been done in order to develop such shielding materials by targeting Mg. The dependence in shielding effectiveness on variation in heat treatment, concentrations of the alloying elements, forming processes and its combinations have been addressed in this review.
Gagan Kumar; Ritu Rani; Vijayender Singh; Sucheta Sharma; Khalid M. Batoo; M. Singh
Abstract
Co 2+ substituted Mg-Mn nanoferrites having formulae Mg0.9Mn0.1CoxFe2-xO4, where x = 0.0, 0.1, 0.2 & 0.3, have been prepared for the first time by solution combustion technique. The magnetic properties of nanoferrites such as M-H, initial permeability (μi) and magnetic loss tangent (tan δ) ...
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Co 2+ substituted Mg-Mn nanoferrites having formulae Mg0.9Mn0.1CoxFe2-xO4, where x = 0.0, 0.1, 0.2 & 0.3, have been prepared for the first time by solution combustion technique. The magnetic properties of nanoferrites such as M-H, initial permeability (μi) and magnetic loss tangent (tan δ) have been investigated as a function of frequency in the range 700 Hz to 30 MHz. X-ray diffraction patterns confirmed the formation of single phase spinel structure of all the nanoferrites. The surface morphology of the samples is studied by using scanning electron microscopy (SEM), while elemental compositions of samples are studied by energy dispersive X-ray analysis (EDAX). Saturation magnetization (Ms) and magneto-crystalline anisotropy constant (K1) are found to be increasing with an increase in cobalt content while initial permeability and magnetic loss tangent are found to be decreasing with an increase in frequency as well as with the increasing concentration of Co 2+ ions. The very low values of magnetic loss tangent even at high frequencies are the prime achievements of the present work.