Kumar, Gagan and Shah, Jyoti and Kotnala, R. K. and Singh, Virender Pratap and -, Sarveena and Garg, Godawari and Shirsath, Sagar E. and Batoo, Khalid M. and Singh, Mahavir (2015) Superparamagnetic behaviour and evidence of weakening in super-exchange interactions with the substitution of Gd3+ ions in the Mg-Mn nanoferrite matrix. Materials Research Bulletin, 63. 216-225 . ISSN 0025-5408

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Abstract

The Gd3+ substituted Mg-Mn nanoferrites with generic formula Mg0.9Mn0.1GdxFe2-xO4 (x = 0.05, 0.1, 0.2, 0.3) have been prepared for the first time by self-ignited solution combustion method. The X-ray analysis confirmed the formation of single phase cubic spinel structure. Gd3+ substitution has resulted in an increase in the crystallite size (13.4-16.1 nm) and lattice parameter (8.35-8.38 angstrom). The M-H and ZFC-FC study revealed that all nanoferrites are of superparamagnetic in nature. The saturation magnetization (M-s) has been observed to decrease with the incorporation of Gd3+ ions. The cation's distribution has been estimated by using the magnetic characterization method. The magnetic properties such as initial permeability (mu(i)) and magnetic loss tangent (tan delta) have been investigated as a function of frequency. The initial permeability has been observed to be almost constant with frequency and in each nanoferrite an onset of resonance is observed. In addition, very low values of 'tan delta' were obtained.

Item Type:	Article
Uncontrolled Keywords:	Magnetic materials Magnetic properties
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	21 Oct 2016 05:29
Last Modified:	21 Oct 2016 05:29
URI:	http://npl.csircentral.net/id/eprint/2020

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