Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets

Young Gil Park, Daisuke Shindo

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Microstructures and magnetic domain structures of melt-spun Nd-Fe-B permanent magnets were investigated in detail by analytical electron microscopy and electron holography. While the crystal orientation of matrix Nd 2Fe14B grains was analyzed by nanobeam electron diffraction, precipitates of a few tens of nanometers at grain boundaries were identified to be α-Fe by energy-dispersive X-ray spectroscopy. The detailed magnetization distribution in Nd2Fe14B grains and at their boundaries was visualized by electron holography. Ex situ experimentation with an electromagnet revealed that the domain walls in the demagnetized state and remanent states were pinned at grain boundaries, and Fe precipitates at the grain boundary were situated at the center of the closure domain.

    Original languageEnglish
    Pages (from-to)43-47
    Number of pages5
    JournalJournal of Electron Microscopy
    Volume53
    Issue number1
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Domain wall pinning
    • Electron holography
    • Energy-dispersive X-ray spectroscopy
    • Lines of magnetic flux
    • Nanobeam electron diffraction
    • ex situ experiment

    ASJC Scopus subject areas

    • Instrumentation

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