Ferromagnetic enhancement in the clusters of Co-Pd magnetic nanoparticles induced by the formation of cross-linkage

Yoshikazu Ito, Kazuyuki Takai, Toshiaki Enoki

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Co-Pd alloy nanoparticles with the surface modified with carboxylic acid functional groups are prepared to connect the nanoparticles with a cross-linkage of calcium ion (Ca2+). The morphology of the resulting nanoparticles can be controlled with the Ca2+ ion concentration. At diluted concentrations, a dimer structure is formed, in which constituent nanoparticles are coupled ferromagnetically with the aid of dipole-dipole interaction. At high concentrations, many nanoparticles are multiple-cross-linked, resulting in forming highly packed three-dimensional structures. The magnetization is strongly enhanced 8 times as large as that of pristine sample owing to dipolar ferromagnetism in the 3D structures.

    Original languageEnglish
    Pages (from-to)8971-8975
    Number of pages5
    JournalJournal of Physical Chemistry C
    Volume115
    Issue number18
    DOIs
    Publication statusPublished - 2011 May 12

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Energy(all)
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films

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