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Synthesis and magnetic properties of FeNi 3 /Al 2 O 3 core-shell nanocomposites

Author

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  • W. Liu
  • W. Zhong
  • H. Y. Jiang
  • N. J. Tang
  • X. L. Wu
  • W. Y. Du

Abstract

In this study, FeNi 3 /Al 2 O 3 core-shell nanocomposites, where individual FeNi 3 nanoparticles were coated with a thin layer of alumina, were fabricated by a modified sol-gel method. Several physical characterizations were performed on the samples of FeNi 3 /Al 2 O 3 nanocomposites with different thickness of Al 2 O 3 shell. The encapsulation of FeNi 3 nanoparticles with alumina stops FeNi 3 agglomeration during heat treatment, and prevents interaction among the closely spaced magnetic FeNi 3 nanoparticles. The Al 2 O 3 insulating shell improves the soft magnetic properties of FeNi 3 . The study of the complex permeability of the samples shows that the real part μ’ of the permeability of the sample with Al molar content of 20% (Al/(Fe+Ni)) is as high as 12, and independent of frequency up to at least 1 GHz. The tunneling magnetoresistance arising from the presence of the Al 2 O 3 shell have also been studied. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • W. Liu & W. Zhong & H. Y. Jiang & N. J. Tang & X. L. Wu & W. Y. Du, 2005. "Synthesis and magnetic properties of FeNi 3 /Al 2 O 3 core-shell nanocomposites," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 46(4), pages 471-474, August.
    • Handle: RePEc:spr:eurphb:v:46:y:2005:i:4:p:471-474
    DOI: 10.1140/epjb/e2005-00276-2
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