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Nanocomposite Permanent Magnets Based on SrFe12O19-Fe3O4 Hard-Soft Ferrites

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Abstract

Nanocomposites consisting of strontium ferrite and magnetite are prepared to investigate the effect of exchange coupling between the hard and soft magnetic phases. Hexagonal strontium ferrite, SrFe12O19, synthesized using a solid-state route involving the sintering of precursors at 1000 °C gives a coercivity value as high as 3.73 kOe. An increase in the sintering temperature results in an increase in particle size and a decrease in coercivity. The soft ferrite phase Fe3O4 synthesized by a reverse co-precipitation method shows a saturation magnetization as high as 84 emu/g. Simple homogenous mixing of soft and hard components resulted in an exchange-coupled magnetic nanocomposite. With an increase in the soft magnetic content, the magnetization of the composite increases while the coercivity decreases. On sintering the nanocomposites at 1000 °C, coercivity remains intact even for an increasing soft magnetic content indicating an exchange decoupling between the soft and hard phases. This is attributed to the phase transformation of Fe3O4 to α-Fe2O3 at elevated temperatures.

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Acknowledgements

This work is financially supported by the Cochin University of Science and Technology via SMNRI Grant (No. PL.(UGC)1/SPG//SMNRI/2017-18 dated 02/11/2017) and University Grants Commission via Start-up Grant (No. F.30-415/2018(BSR) dated 06/02/2019). SAS acknowledges the Junior Research Fellowship received from the Science and Engineering Research Board (No. ECR/2017/001782 dated 04/10/2018). Fruitful discussions with Navya Joseph and Archana V N are gratefully acknowledged. The authors acknowledge DST-FIST for creating the FE-SEM facility at the Department of Physics, Cochin University of Science and Technology, Kochi, Kerala, India.

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Authors and Affiliations

  1. Department of Physics, Cochin University of Science and Technology, Cochin, 682022, India

    Shan Abraham Sam & Senoy Thomas

  2. Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, M13 9PL, UK

    Aravind Puthirath Balan & Rahul Raveendran Nair

  3. National Graphene Institute, The University of Manchester, Manchester, M13 9PL, UK

    Aravind Puthirath Balan & Rahul Raveendran Nair

  4. Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India

    Aswathy Kaipamangalath & Manoj Raama Varma

  5. Inter-University Centre for Nanomaterials and Devices, Cochin University of Science and Technology, Cochin, 682022, India

    Senoy Thomas

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  1. Shan Abraham Sam
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Sam, S.A., Balan, A.P., Kaipamangalath, A. et al. Nanocomposite Permanent Magnets Based on SrFe12O19-Fe3O4 Hard-Soft Ferrites. J Supercond Nov Magn 34, 3333–3344 (2021). https://doi.org/10.1007/s10948-021-06070-y

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