Fe-B-P-Cu nanocrystalline soft magnetic alloys with high Bs

Akiri Urata, Hiroyuki Matsumoto, Shigeyoshi Yoshida, Akihiro Makino

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


The effects of the addition of Cu on the crystallization processes, nanostructures and soft magnetic properties for the Fe80.8-84.8B 8-10P6-8Cu1.2 alloys were investigated. The Fe-B-P-Cu alloys show two separated distinct exothermic peaks upon heating due to the addition of Cu. Furthermore, the interval temperature between each one for the Fe82.8B9P7Cu1.2 alloy is 103 K, and the first and second exothermic peaks result from the phase transition from amorphous to α-Fe and then to Fe3(B,P), respectively. A uniform nanocrystalline structure composed of α-Fe grains with a 17 nm diameter was realized by annealing just above the first exothermic peak, and this nanocrystalline alloy exhibits high Bs of 1.70 T and low H c of 4.9 A/m. Therefore, the nanocrystalline Fe-B-P-Cu soft magnetic alloy with high Bs and low Hc has a large industrial advantage due to miniaturization, high efficiency and low material cost of electric devices.

Original languageEnglish
Pages (from-to)S431-S433
JournalJournal of Alloys and Compounds
Issue numberSUPPL. 1
Publication statusPublished - 2011 Jul 14


  • High saturation magnetic flux density
  • Nanocrystalline alloy
  • Soft magnetic material

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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