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Ferroelectric and ferromagnetic properties of Gd substituted nickel ferrite
Date Issued
21-04-2008
Author(s)
Kamala Bharathi, K.
Indian Institute of Technology, Madras
Abstract
Ferromagnetic and ferroelectric characteristics of Gd substituted nickel ferrite (NiO Fe1.925 Gd0.075 O3) were investigated. The material formed in the cubic inverse spinel phase and in addition, a small amount of GdFe O3 phase was identified. A small distortion of the cubic lattice was observed upon the substitution of Fe by Gd in the B site. Substitution of Gd for Fe lowered the saturation magnetization. However, the saturation magnetostriction is seen not to change significantly by the substitution of Gd. From the temperature variation of dielectric constant measurement, the ferroelectric transition temperature was found to be 512 K. The existence of the ferroelectricity was confirmed from the ferroelectric loop. The (high) dielectric constant with frequency is seen to reveal a dispersion of relaxation times. © 2008 American Institute of Physics.
Volume
103