Characterization of microstructure and magnetic domain structure in Sm-Co based permanent magnets by advanced transmission electron microscopy

Jun Mo Yang, Daisuke Shindo, Masaki Takeguchi, Masahiro Kawasaki, Tetsuo Oikawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Microstructure and magnetic domain structure of Sm(Co0.653Fe0.257Cu0.066Zr0.024)7.3-permanent magnets were investigated by advanced transmission electron microscopy (TEM), using techniques such as high-resolution electron microscopy (HREM) and Lorentz electron microscopy with a high-voltage electron microscope, and an elemental mapping method utilizing a small electron probe with a field-emission electron gun. As a result, the crystallographic arrangement of cellular microstructures including the Z phase and the composition distribution in the cell boundary phase were accurately evaluated. Also, the magnetic domain wall width was precisely measured from the intensity distribution of Lorentz electron microscope images recorded with the imaging plate. Furthermore, the magnetic field in both the inside and the outside of this material was observed by an electron holography technique for the first time.

Original languageEnglish
Pages (from-to)542-548
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume63
Issue number4
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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