Magnetic domain structures in electrical steel sheets studied by Lorentz microscopy and electron holography

Zentaro Akase, Young Gil Park, Daisuke Shindo, Toshiro Tomida, Hiroyosi Yashiki, Shigeharu Hinotani

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Magnetic domain structures of doubly oriented and non-oriented electrical steel sheets, the former of which has two perpendicular magnetic easy axes in the sheet plane, have been observed by Lorentz microscopy and electron holography. In the demagnetized state, the doubly oriented electrical steel sheet shows straight lines of domain walls with homogeneous distribution of lines of magnetic flux. On the other hand, non-oriented electrical steel shows irregular distribution of domain walls with curved lines of magnetic flux. Through the in situ observation of magnetization process of these electrical steel sheets, it has been found that domain walls in doubly oriented electrical steel sheets move continuously, while domain walls in non-oriented electrical steel sheets move discontinuously. It has been also clarified that the domain walls in non-oriented electrical steel sheets are pinned at the precipitates which are considered to consist of Al2O3, SiO2, MnO and TiO2. These differences in the movement of domain walls are briefly discussed with their magnetic properties.

Original languageEnglish
Pages (from-to)974-977
Number of pages4
JournalMaterials Transactions
Volume46
Issue number5
DOIs
Publication statusPublished - 2005 May

Keywords

  • Electrical steel sheet
  • Electron holography
  • Lorentz microscopy
  • Magnetic domain structure

ASJC Scopus subject areas

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

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