Magnetic Study Of Nano-crystalline Cobalt Substituted Mg-Mn Ferrites Processed Via Solution Combustion Technique

¹Department of Physics, Himachal Pradesh University, Shimla, 171005, India

²King Abdullah Institute for Nanotechnology, King Saud University, P. O. Box 2460, Riyadh, 11451, Saudi Arabia

Adv. Mater. Lett., 2013, Current Issue , 4 (9), pp 682-687

DOI: 10.5185/amlett.2013.1409

Publication Date (Web): Aug 10, 2013

Copyright © IAAM-VBRI Press

E-mail: bhargava_phy_hpu@yahoo.co.in

Abstract

Co²⁺ substituted Mg-Mn nanoferrites having formulae Mg_0.9Mn_0.1CoxFe_2-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 Co²⁺ ions. The very low values of magnetic loss tangent even at high frequencies are the prime achievements of the present work.

Keywords

Mg-Mn nanoferrites, X-ray diffraction, M-H, initial permeability.