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Influence of microstructure and preparation methods on the magneto-crystalline structure and magnetic properties of submicron barium hexaferrite powders

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Abstract

We report studies on the correlation between the microstructure, the magneto-crystalline structure, and the magnetic properties of barium hexaferrite powders. The samples consisted of typical hexagonal plate-like particles with approximate sizes of 80, 180, and 500 nm, obtained by microemulsion, coprecipitation, and solid-state reaction techniques, respectively, and were characterized by x-ray powder diffraction and scanning and transmission electron microscopy. The hyperfine parameters of the hexaferrite powders with different particle size were investigated by Mössbauer spectroscopy. We also measured the magnetization-versus-magnetic field dependence of the submicron powders at high magnetic fields up to 30 T at 4.2 K. Finally, we comment on the surface effects observed because of particle size reduction from micron to nanoscale dimensions.

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Authors and Affiliations

  1. Institute of Electronics, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria

    I. Nedkov, T. Koutzarova, Ch. Ghelev & P. Lukanov

  2. “Jozef Stefan” Institute, Jamova 39, 1000, Ljubljana, Slovenia

    D. Lisjak & D. Makovec

  3. Department of Subatomic and Radiation Physics, University of Gent, 9000, Gent, Belgium

    R. E. Vandenberghe

  4. International Laboratory of High Magnetic Fields and Low Temperatures, 53-529, Wroclaw, Poland

    A. Gilewski

Authors
  1. I. Nedkov
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  2. T. Koutzarova
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  3. Ch. Ghelev
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  4. P. Lukanov
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  5. D. Lisjak
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  6. D. Makovec
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  7. R. E. Vandenberghe
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  8. A. Gilewski
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Correspondence to I. Nedkov.

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Nedkov, I., Koutzarova, T., Ghelev, C. et al. Influence of microstructure and preparation methods on the magneto-crystalline structure and magnetic properties of submicron barium hexaferrite powders. Journal of Materials Research 21, 2606–2610 (2006). https://doi.org/10.1557/jmr.2006.0314

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  • DOI: https://doi.org/10.1557/jmr.2006.0314

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