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 journalArticle

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

Fingerprint

Magnetic domains
Photoemission
magnetic domains
Electron microscopy
dichroism
Magnets
Demagnetization
electron microscopy
magnets
photoelectric emission
X rays
demagnetization
Surface phenomena
x rays
High resolution electron microscopy
Coercive force
Magnetization
Grain boundaries
coercivity
Imaging techniques

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
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Yamamoto, S., Yonemura, M., Wakita, T., Fukumoto, K., Nakamura, T., Kinoshita, T., ... Kakeshita, T. (2008). Magnetic-domain structure analysis of Nd-Fe-B sintered magnets using XMCD-PEEM technique. Materials Transactions, 49(10), 2354-2359. https://doi.org/10.2320/matertrans.MRA2008141

Magnetic-domain structure analysis of Nd-Fe-B sintered magnets using XMCD-PEEM technique. / Yamamoto, Sukeyoshi; Yonemura, Mitsuharu; Wakita, Takanori; Fukumoto, Keiki; Nakamura, Tetsuya; Kinoshita, Toyohiko; Watanabe, Yoshio; Fang, Zhun Guo; Sato, Masugu; Terai, Tomoyuki; Kakeshita, Tomoyuki.

In: Materials Transactions, Vol. 49, No. 10, 10.2008, p. 2354-2359.

Research output: Contribution to journalArticle

Yamamoto, S, Yonemura, M, Wakita, T, Fukumoto, K, Nakamura, T, Kinoshita, T, Watanabe, Y, Fang, ZG, Sato, M, Terai, T & Kakeshita, T 2008, 'Magnetic-domain structure analysis of Nd-Fe-B sintered magnets using XMCD-PEEM technique', Materials Transactions, vol. 49, no. 10, pp. 2354-2359. https://doi.org/10.2320/matertrans.MRA2008141
Yamamoto, Sukeyoshi ; Yonemura, Mitsuharu ; Wakita, Takanori ; Fukumoto, Keiki ; Nakamura, Tetsuya ; Kinoshita, Toyohiko ; Watanabe, Yoshio ; Fang, Zhun Guo ; Sato, Masugu ; Terai, Tomoyuki ; Kakeshita, Tomoyuki. / Magnetic-domain structure analysis of Nd-Fe-B sintered magnets using XMCD-PEEM technique. In: Materials Transactions. 2008 ; Vol. 49, No. 10. pp. 2354-2359.
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