Magnetic domain evolution in Nd-Fe-B:Cu sintered magnet visualized by scanning hard X-ray microprobe

Motohiro Suzuki, Akira Yasui, Yoshinori Kotani, Naruki Tsuji, Tetsuya Nakamura, Satoshi Hirosawa

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The formation and development of the magnetic domain structures of an Nd2Fe14B sintered magnet doped with 0.1% Cu are studied during the demagnetization process. A scanning hard X-ray microprobe with X-ray magnetic circular dichroism at the Nd L2 edge is applied to investigate the evolution of magnetic domains with the applied magnetic field on a fractured surface. Reversed magnetic domains are initially formed in the Nd-Fe-B main phase grains beside the Cu-abundant regions that superposes on an Nd-rich phase. This characteristic formation of initial domains is reproducibly observed throughout several demagnetization cycles after the magnetization becomes saturated, suggesting the presence of specific nucleation sites that trigger the magnetization reversal.

Original languageEnglish
Pages (from-to)155-161
Number of pages7
JournalActa Materialia
Volume106
DOIs
Publication statusPublished - 2016 Mar
Externally publishedYes

Keywords

  • Magnetic domains
  • Magnetization process
  • Microstructures
  • Nd-Fe-B sintered magnets
  • X-ray magnetic imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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