Magnetic-domain structure analysis of Nd-Fe-B sintered magnets using XMCD-PEEM technique

Sukeyoshi Yamamoto, Mitsuharu Yonemura, Takanori Wakita, Keiki Fukumoto, Tetsuya Nakamura, Toyohiko Kinoshita, Yoshio Watanabe, Zhun Guo Fang, Masugu Sato, Tomoyuki Terai, Tomoyuki Kakeshita

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    A combination of X-Ray Magnetic Circular Dichroism and PhotoEmission Electron Microscopy (XMCD-PEEM) was applied to the magnetic domain analysis of Nd-Fe-B sintered magnets. The XMCD-PEEM high-resolution images revealed both the magnetic domain structures and the microstructural morphologies. In the thermally demagnetized state, each grain in a polycrystalline sample exhibits a multi-domain structure, which is magnetically coupled across grain boundaries. After the DC field-demagnetization, it changed to a single domain structure. The magnetization vector in each surface grain reversed to the negative direction during the field-demagnetization procedure because of the small coercivity in the surface region. In the present study, we observed this surface domain reversal for the first time by means of XMCD-PEEM imaging method, which is important in order to understand the surface phenomena of Nd-Fe-B magnets.

    Original languageEnglish
    Pages (from-to)2354-2359
    Number of pages6
    JournalMaterials Transactions
    Volume49
    Issue number10
    DOIs
    Publication statusPublished - Oct 2008

    Keywords

    • Magnet
    • Magnetic-domain
    • Neodymium-iron-boron
    • Photoemission electron microscopy
    • X-ray magnetic circular dichroism

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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