Quasi-dislocation dipole-type defects and low coercivity of Fe-based soft magnetic glassy alloys

Teruo Bitoh, Akihiro Makino, Akihisa Inoue

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9 Citations (Scopus)

Abstract

The density and the magnetization process of the melt-spun glassy Fe-(A1, Ga)-(P, C, B, Si) alloys have been investigated to clarify the origin of low coercivity (Hc) of the glassy alloys. The density differences (Δpc) between the crystalline and the amorphous phases of the glassy alloys are much smaller than that of the ordinary amorphous alloys. An analysis of the magnetization process based on the law of approach to ferromagnetic saturation reveals that quasi-dislocation dipole (QDD)-type defects, which are formed by agglomeration of vacancy-type point defects in planar regions, are the main sources of elastic stress and their size is nearly independent of the alloy system. Since Hc originates from elastic stress of QDDs is proportional (Δpc)1/2, the origin of the low Hc of the Fe-(Al, Ga)-(P, C, B, Si) glassy alloys is the low density of QDDs which corresponds to low density of the domain-wall pinning centers.

Original languageEnglish
Pages (from-to)427-430
Number of pages4
JournalJournal of Metastable and Nanocrystalline Materials
Volume24-25
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • Coercivity
  • Fe-based glassy alloy
  • Free volume
  • Magnetization process
  • Quasi-dislocation dipole-type defect

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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