Strain induced magnetism and superexchange interaction in Cr substituted nanocrystalline cobalt ferrite

Kumar, Lawrence and Kumar, Pawan and Kuncser, Victor and Greculeasa, Simona and Sahoo, Balaram and Kar, Manoranjan (2018) Strain induced magnetism and superexchange interaction in Cr substituted nanocrystalline cobalt ferrite. In: MATERIALS CHEMISTRY AND PHYSICS, 211 . pp. 54-64.

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Abstract

Distribution of magnetic relaxation time using Mossbauer spectroscopy has been observed for CoFe2-xCrxO4 (0.1 <= x <= 0.4) annealed at lower temperature (<= 400 degrees C). The estimated cation distribution over A and B sites observed by Mossbauer spectroscopy is consistent with that obtained by the Rietveld analysis of the X-ray diffraction patterns. Saturation magnetization and magnetocrystalline anisotropy constant increase up to 20% of Cr (x = 0.2) substitution and, decrease with further increase of x. However, the coercive field as well as the Neel temperature decreases with increase in Cr(3+ )concentration, i.e., a crossover from the hard magnetic to soft magnetic nature by Cr substitution at the Fe site of CoFe2O4 has been observed. This behavior is attributed to the competition between strain induced magnetism and superexchange interaction between cations. (C) 2018 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS CHEMISTRY AND PHYSICS
Publisher:	ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Additional Information:	Copy right for this article belong to ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 May 2018 15:58
Last Modified:	25 Aug 2022 04:31
URI:	https://eprints.iisc.ac.in/id/eprint/59855

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