Industrialization of nanocrystalline Fe-Si-B-P-Cu alloys for high magnetic flux density cores

Kana Takenaka, Albertus D. Setyawan, Parmanand Sharma, Nobuyuki Nishiyama, Akihiro Makino

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)


Nanocrystalline Fe-Si-B-P-Cu alloys exhibit high saturation magnetic flux density (Bs) and extremely low magnetic core loss (W), simultaneously. Low amorphous-forming ability of these alloys hinders their application potential in power transformers and motors. Here we report a solution to this problem. Minor addition of C is found to be effective in increasing the amorphous-forming ability of Fe-Si-B-P-Cu alloys. It allows fabrication of 120 mm wide ribbons (which was limited to less than 40 mm) without noticeable degradation in magnetic properties. The nanocrystalline (Fe85.7Si0.5B9.5P3.5Cu0.8)99C1 ribbons exhibit low coercivity (Hc)~4.5 A/m, high Bs~1.83 T and low W~0.27 W/kg (@ 1.5 T and 50 Hz).

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Publication statusPublished - 2016 Mar 1


  • High saturation magnetic flux density
  • Low core loss
  • Nanocrystalline alloy
  • Soft magnetic material


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