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Magnetization reversal and tunable exchange bias behavior in Mn-substituted NiCr2O4

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Abstract

Single phase samples of Ni(Cr1−xMn x )2O4 (x = 0–0.50) were synthesized by using sol–gel route. Investigation of structural, magnetic, exchange bias and magnetization reversal properties was carried out in the bulk samples of Ni(Cr1−xMn x )2O4. Rietveld refinement of the X-ray diffraction patterns recorded at room temperature reveals the tetragonal structure for x = 0 sample with I41/amd space group and cubic structure for x ≥ 0.05 samples with \( {\text{Fd}\bar{3}\text{m}} \) space group. Magnetization measurements show that all samples exhibit ferrimagnetic behavior, and the transition temperature (TC) is found to increase from 73 K for x = 0 to 138 K for x = 0.50. Mn substitution induces magnetization reversal behavior especially for 30 at% of Mn in NiCr2O4 system with a magnetic compensation temperature of 45 K. This magnetization reversal is explained in terms of different site occupation of Mn ions and the different temperature dependence of the magnetic moments of different sublattices. Study of exchange bias behavior in x = 0.10 and 0.30 samples reveals that they exhibit negative and tunable positive and negative exchange bias behavior, respectively. The magnitudes of maximum exchange bias field of these samples are found to be 640 and 5306 Oe, respectively. Exchange bias in x = 0.10 sample originates from the anisotropic exchange interaction between the ferrimagnetic and the antiferromagnetic components of magnetic moment. The tunable exchange bias behavior in x = 0.30 sample is explained in terms of change in domination of one sublattice moment over the other as the temperature is varied.

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Acknowledgements

We acknowledge CIF, IIT Guwahati for FESEM facility.

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  1. Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India

    Junmoni Barman & S. Ravi

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  1. Junmoni Barman
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  2. S. Ravi
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Correspondence to S. Ravi.

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Barman, J., Ravi, S. Magnetization reversal and tunable exchange bias behavior in Mn-substituted NiCr2O4. J Mater Sci 53, 7187–7198 (2018). https://doi.org/10.1007/s10853-018-2073-2

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