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

11 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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