Induced Size Effects Of Gd3+ ions Doping On Structural And Magnetic Properties Of Ni-Zn Ferrite Nanoparticles

¹G.G.M. Science College, Canal Road, Jammu (J&K) 180001, India

²National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K.S. Krishnan Road, New Delhi 110012, India

Adv. Mater. Lett., 2012, Current Issue, 3 (5), pp 399-405

DOI: 10.5185/amlett.2011.7288

Publication Date (Web): Sep 16, 2012

Copyright © IAAM-VBRI Press

E-mail: aks@nplindia.ernet.in

Abstract

Gd³⁺ ions substituted in Ni_0.5Zn_0.5Gd_xFe_2-xO₄ (where x = 0.1, 0.2, 0.3) ferrite nanoparticles in the size range from 15 to 25 nm were prepared by chemical method. The effect of Gd³⁺ ions in spinel structure in correlation to structural and magnetic properties have been studied in detail using XRD, HRTEM and EPR techniques. The spin resonance confirms the ferromagnetic behaviour of these nanoparticles and higher order of dipolar-dipolar interaction. On increasing Gd³⁺ ions concentrations, the super exchange interaction i.e. increase in movement of electron among Gd³⁺ - O - Fe³⁺ in the core group and the spin biasing in the glass layer has been interpreted. The decrease in ‘g’ value and increase in relaxation time is well correlated with the change of particle size on different concentrations of Gd³⁺ ions in Ni-Zn ferrite.

Keywords

Spinel ferrite, nanoparticles, HRTEM, EPR, g Ã,¢,â,&sbquo,¬,â,&euro,&oelig, value, resonance field, line width.