Chemically enabling CoFe2O4 for magnetostrictive strain sensing applications at lower magnetic fields: Effect of Zn substitution

Anantharamaiah, PN and Shashanka, HM and Kumar, R and Chelvane, JA and Sahoo, B (2021) Chemically enabling CoFe2O4 for magnetostrictive strain sensing applications at lower magnetic fields: Effect of Zn substitution. In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 266 .

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Abstract

Phase pure cobalt-ferrite (CoFe2O4) and Zn-substituted CoFe2O4 (Co0.8Zn0.2Fe2O4 and CoFe1.8Zn0.2O4) nanopowders were synthesized by a glycine-nitrate auto-combustion route without any post-calcination process. The as-synthesized nano-ferrite powders were first pelletized, sintered and studied. Our results show that the crystallographic site preference of Zn, cation distribution, change in the oxidation state of Co-cation (+2 to + 3), and reduction in magnetic A-O-B superexchange interactions of the AB2O4 type spinel structure have a direct consequence on the excellent magnetostriction behavior of the samples. Our results demonstrate that although the observed λmax values of the Zn-substituted samples are lower than the unsubstituted sample, importantly, the magnitude of the maximum strain sensitivity (dλ/dHmax) of the Zn-substituted samples (~3.6 � 10-9 m/A) is nearly 300% higher than the parent compound (~1.18 � 10-9 m/A), even at remarkably low magnetic fields. This facilitates the direct use of our samples for highly sensitive strain sensor applications. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	25 Feb 2021 09:53
Last Modified:	25 Feb 2021 09:53
URI:	http://eprints.iisc.ac.in/id/eprint/67998

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