Enhancing the strain sensitivity of CoFe2O4 at low magnetic fields without affecting the magnetostriction coefficient by substitution of small amounts of Mg for Fe

P. N. Anantharamaiah; P. A. Joy

doi:10.1039/C6CP00369A

Enhancing the strain sensitivity of CoFe₂O₄ at low magnetic fields without affecting the magnetostriction coefficient by substitution of small amounts of Mg for Fe

P. N. Anantharamaiah^a^b and P. A. Joy*^a^b

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^a Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Pune 411008, India
E-mail: pa.joy@ncl.res.in
Fax: +91 20 2590 2636
Tel: +91 20 2590 2273

^b Academy of Scientific and Innovative Research (AcSIR), CSIR-NCL, Pune 411008, India

Abstract

Attaining high magnetostrictive strain sensitivity (dλ/dH) with high magnetostriction strain (λ) is desirable for sintered polycrystalline cobalt ferrite for various applications. It is shown that substitution of a small amount of Fe³⁺ by Mg²⁺ in CoMg_xFe_2−xO₄ (x < 0.1) gives a comparable maximum magnetostriction coefficient to that of the unsubstituted counterpart, with large improvement in the strain sensitivity at relatively low magnetic fields. A large increase in the magnetostriction coefficient is obtained at low magnetic fields for the substituted compositions. The magnetostriction parameters are further enhanced by magnetic field annealing of the sintered products. The results are analyzed based on powder XRD, Raman spectroscopy, XPS and magnetic measurements and based on the results from these studies, the changes in the magnetostriction parameters are correlated with the changes in the cation distribution, magnetic anisotropy and microstructure.

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Publication details

The article was received on 18 Jan 2016, accepted on 12 Mar 2016 and first published on 15 Mar 2016

Article type: Paper

DOI: 10.1039/C6CP00369A

Citation: Phys. Chem. Chem. Phys., 2016,18, 10516-10527

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Enhancing the strain sensitivity of CoFe₂O₄ at low magnetic fields without affecting the magnetostriction coefficient by substitution of small amounts of Mg for Fe

P. N. Anantharamaiah and P. A. Joy, Phys. Chem. Chem. Phys., 2016, 18, 10516
DOI: 10.1039/C6CP00369A
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Physical Chemistry Chemical Physics

Enhancing the strain sensitivity of CoFe₂O₄ at low magnetic fields without affecting the magnetostriction coefficient by substitution of small amounts of Mg for Fe

Abstract

Supplementary files

Publication details

Enhancing the strain sensitivity of CoFe₂O₄ at low magnetic fields without affecting the magnetostriction coefficient by substitution of small amounts of Mg for Fe

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