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Synthesis and Magnetic Properties of Nanocrystalline FeTiO3 Materials

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Abstract

Ilmenite (FeTiO3) nanoparticles with different size distributions were prepared through a sol-gel auto-ignition method. As-prepared powder is annealed at moderate temperatures to get nanocrystalline FeTiO3, and structural, micro-structural, and magnetization characterizations are carried out. Magnetization vs temperature shows antiferromagnetic ordering around 52 K and below 15 K a weak ferromagnetic order develops. The Curie-Weiss law is well obeyed above the Néel temperature (T N) for all samples. Hysteresis curves show finite coercivity below the peak temperature and none at room temperature. M-H curves for all the samples cooled with a bias magnetic field show exchange bias below T N which is interpreted due to the finite size and surface effects. The exchange bias is attributed to weak ferromagnetism due to surface spin disorder (Dzyaloshinskii-Moriya interaction) and ferromagnetic interaction (double exchange) due to mixed valence states of Fe ions.

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Acknowledgements

Dr. A. Sendil Kumar thanks the National Academy of Sciences (India) for Research Associateship under the Scheme of Senior Scientist Platinum Jubilee Fellow awarded to Prof. A. K. Bhatnagar. The authors thank the Centre for Nanotechnology and Central Instrumentation Laboratory (CIL) of the University of Hyderabad for the experimental facilities for this work.

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Authors and Affiliations

  1. School of Engineering Sciences & Technology, University of Hyderabad, Hyderabad, Telangana, 500 046, India

    P. Srinivas & Anil K. Bhatnagar

  2. School of Physics, University of Hyderabad, Hyderabad, Telangana, 500 046, India

    A. Sendil Kumar & Anil K. Bhatnagar

  3. UGC-DAE Consortium for Scientific Research, Mumbai Centre, BARC Campus, Mumbai, Maharastra, 400 085, India

    P. D. Babu

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  1. P. Srinivas
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  2. A. Sendil Kumar
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Correspondence to A. Sendil Kumar or Anil K. Bhatnagar.

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Srinivas, P., Kumar, A.S., Babu, P.D. et al. Synthesis and Magnetic Properties of Nanocrystalline FeTiO3 Materials. J Supercond Nov Magn 31, 1189–1197 (2018). https://doi.org/10.1007/s10948-017-4278-z

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  • DOI: https://doi.org/10.1007/s10948-017-4278-z

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