Effect of Si on the field-induced anisotropy in Fe-rich nanocrystalline soft magnetic alloys

R. Parsons, J. S. Garitaonandia, Takeshi Yanai, K. Onodera, Hidefumi Kishimoto, Takahiro A Kato, K. Suzuki

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31 Citations (Scopus)


The field-induced magnetic anisotropy (Ku) and hyperfine interactions have been investigated for nanocrystalline Febal.B14∼14.8SixCu1.5 (x = 0, 1, 2 and 4) alloys. 57Fe Mössbauer spectroscopy was used to quantify the Si contents and volume fractions of the amorphous and bcc-Fe(Si) phases after nanocrystallisation. This information was then used to estimate the local Ku contribution from the bcc-Fe(Si) phase. The bulk Ku value of these nanocrystalline alloys showed an increase from 40 ± 5 J/m3 to 69 ± 5 J/m3 with increasing Si content from 0 to 4 at%. The local Ku of the bcc-Fe(Si) phase was found to increase in line with Si content, as predicted by the well-known directional pair ordering model and showed a large value of 172 ± 14 J/m3 for a local Si content of around 6 at%. The addition of Si to Fe-rich nanocrystalline alloys is widely perceived as an effective means for improving magnetic softness. However, the findings of this study imply that small additions of Si to Fe-rich nanocrystalline alloys may result in undesirable effects if the crystalline volume fraction is especially large.

Original languageEnglish
Pages (from-to)3156-3162
Number of pages7
JournalJournal of Alloys and Compounds
Publication statusPublished - 25 Feb 2017


  • Amorphous alloys
  • Field induced anisotropy
  • Mössbauer spectroscopy
  • Nanocrystalline alloys
  • Planar flow casting
  • Random anisotropy

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