Structural Heterogeneity of the Melt-spun (Fe, Co)-Si-B-P-Cu Alloy with Excellent Soft Magnetic Properties

Kazuhisa Sato, Kana Takenaka, Akihiro Makino, Yoshihiko Hirotsu

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


A structural heterogeneity of a newly developed soft magnetic Fe81.2Co4Si0.5B9.5P4Cu0.8 melt-spun alloy has been studied by transmission electron microscopy (TEM) and electron diffraction. Hollow-cone dark-field TEM imaging revealed that the density of coherent scattering regions in the as-quenched Fe81.2Co4Si0.5B9.5P4Cu0.8 alloy is as high as that in the Fe85.2Si2B8P4Cu0.8 hetero-amorphous alloy (NANOMET®). According to the aberration-corrected high-resolution TEM, crystalline atomic clusters, typically of ∼1 nm in diameter, are densely distributed in an amorphous matrix of Fe81.2Co4Si0.5B9.5P4Cu0.8 alloy, while nanobeam electron diffraction detected weak Bragg reflections from Fe clusters with the body centered cubic structure. These results unambiguously reveal structural heterogeneity of the as-quenched Fe81.2Co4Si0.5B9.5P4Cu0.8 alloy, which is similar to that observed in the NANOMET®.

Original languageEnglish
Pages (from-to)1376-1380
Number of pages5
JournalPhysics Procedia
Publication statusPublished - 2015
Event20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain
Duration: 2015 Jul 52015 Jul 10


  • Fe cluster
  • Hetero-amorphous
  • Soft magnetic material
  • Structural heterogeneity


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