High-resolution electron microscopy study of microstructural changes in magnetic FeNbB films in the course of annealing

Munehiro Nakamura, Yoshihiko Hirotsu, Kazunori Anazawa, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto

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23 Citations (Scopus)

Abstract

The microstructural change in sputter-deposited Fe79Nb8B13 films on annealing was studied by high-resolution electron microscopy (HREM) and nanobeam transmission electron analysis. Amorphous structures with atomic medium-range order (MRO) were observed in specimens annealed up to 673 K. At 773 K α-Fe nanocrystals as small as 8-10 nm start to precipitate. The α-Fe nanocrystals grow to a size of 12 nm at 923 K. At this temperature, magnetic properties with high saturation magnetization, the highest permeability, and lowest magnetorestriction and coercivity can be obtained. The lattice parameter of the α-Fe precipitates decreases owing to the decrease in Nb content in the precipitates on annealing. Compounds such as Fe3B appear and the soft magnetic properties degrade on annealing at 973 K.

Original languageEnglish
Pages (from-to)487-490
Number of pages4
JournalMaterials Science and Engineering A
Volume179-180
Issue numberPART 1
DOIs
Publication statusPublished - 1994 May 1
Externally publishedYes

ASJC Scopus subject areas

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

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