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

W. Liu, W. Zhong (), H. Y. Jiang, N. J. Tang, X. L. Wu and W. Y. Du

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 46, issue 4, 471-474

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

Date: 2005
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DOI: 10.1140/epjb/e2005-00276-2

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