High magnetostriction parameters for low-temperature sintered cobalt ferrite obtained by two-stage sintering

TitleHigh magnetostriction parameters for low-temperature sintered cobalt ferrite obtained by two-stage sintering
Publication TypeJournal Article
Year of Publication2014
AuthorsMohaideen, KKhaja, Joy, PAlias
JournalJournal of Magnetism and Magnetic Materials
Volume371
Pagination121-129
Date PublishedDEC
ISSN0304-8853
KeywordsCobalt ferrite, Magnetostriction, Two-stage sintering
Abstract

From the studies on the magnetostriction characteristics of two-stage sintered polycrystalline CoFe2O4 made from nanocrystalline powders, it is found that two-stage sintering at low temperatures is very effective for enhancing the density and for attaining higher magnetostriction coefficient. Magnetostriction coefficient and strain derivative are further enhanced by magnetic field annealing and relatively larger enhancement in the magnetostriction parameters is obtained for the samples sintered at lower temperatures, after magnetic annealing, despite the fact that samples sintered at higher temperatures show larger magnetostriction coefficients before annealing. A high magnetostriction coefficient of similar to 380 ppm is obtained after field annealing for the sample sintered at 1100 degrees C, below a magnetic field of 400 kA/m, which is the highest value so far reported at low magnetic fields for sintered polycrystalline cobalt ferrite. (C) 2014 Elsevier B.V. All rights reserved.

DOI10.1016/j.jmmm.2014.07.013
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

2.11

Divison category: 
Physical and Materials Chemistry