Magnetic domain structure and magnetic hardening in Sm-Fe-Mn-N coarse powder

J. J. Kim, H. S. Park, D. Shindo, T. Iseki, N. Oshimura, T. Ishikawa, K. Ohmori

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The magnetic domain structure and magnetization process in Sm 2(Fe0.95,Mn0.05)17N5.0 powders are investigated by Lorentz microscopy and electron holography, The magnetic domain walls are aligned along the magnetization easy axis (c axis) and are connected with one another along amorphous layers that are distributed along the direction parallel to the c axis. On the other hand, it is found that the domain walls are always located in the amorphous layer after domain wall motion. These results reveal that the amorphous layers are the pinning centers of the domain walls. Thus, it is reasonable to consider that the coercivity of a Sm2(Fe0.95,Mn0.05)17N5.0 powder is strongly affected by the distribution of the amorphous layers in the powder.

    Original languageEnglish
    Pages (from-to)2606-2611
    Number of pages6
    JournalMaterials Transactions
    Volume48
    Issue number10
    DOIs
    Publication statusPublished - 2007 Oct

    Keywords

    • Coercivity mechanism
    • Electron holography
    • Lorentz microscopy
    • Samarium-iron-manganese-nitrogen coarse powder

    ASJC Scopus subject areas

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

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