Magnetic structure analysis of Nd-Fe-B based nanocomposite magnets by electron holography

Daisuke Shindo, H. S. Park, Hirokazu Kanekiyo, Satoshi Hirosawa

    研究成果: Article査読

    抄録

    Magnetic flux distribution in Nd-Fe-B based nanocomposite magnets was investigated at nanometer scale by electron holography. Both Nd 4.5Fe 77B 18.5 and Nd-Fe-B-Ti-C, the latter of which was newly developed and commercialized under trade-name of SPRAX, are found to consist of hard and soft magnetic grains of 10-30 nm in diameter. Through the comparison of reconstructed phase images of Nd 4.5Fe 77B 18.5 and Nd-Fe-B-Ti-C, it is found that the lines of magnetic flux of Nd-Fe-B-Ti-C fluctuate more largely than Nd 4.5Fe 77B 18.5 in both demagnetized and remanent states. The fluctuation in the distribution of lines of magnetic flux is considered to result from the randomness in the crystal orientation of the hard magnetic grains with high anisotropy. It is also pointed out that the fluctuated distribution of lines of magnetic flux is consistent with the high coercivity and high maximum energy product of Nd-Fe-B-Ti-C.

    寄稿の翻訳タイトルMagnetic structure analysis of Nd-Fe-B based nanocomposite magnets by electron holography
    本文言語Japanese
    ページ(範囲)962-966
    ページ数5
    ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    69
    11
    DOI
    出版ステータスPublished - 2005 11

    Keywords

    • Coercivity
    • Electron holography
    • Lines of magnetic flux
    • Magnetic flux density
    • Neodymium-Iron-Boron nanocomposite magnets
    • Remanence

    ASJC Scopus subject areas

    • 凝縮系物理学
    • 材料力学
    • 金属および合金
    • 材料化学

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