Magnetic properties of Fe-based amorphous powder cores with high magnetic flux density

Isamu Otsuka, Takeshi Kadomura, Kazushi Ishiyama, Masaaki Yagi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Fe81(Si0.3B0.7)17C2 amorphous powder cores with glass binder were fabricated by compact-pressing techniques, and the relation between magnetic properties and powder particle sizes was evaluated. The Fe81(Si0.3B0.7) 17C2 powder core exhibited superior magnetic properties compared with our previously developed (Fe0.97Cr0.03) 76(Si0.5B0.5)22C2 powder core. The magnetic flux density Bm of the core made of Fe81 system powders at 20 000 A/m was about 29% higher than that of Fe76 system core. The core loss decreased with decreasing particle sizes. For the core made of powders with mean particle size of 22 μm below 45 μm in diameter, the loss at 100 kHz for Bm = 0.1 T was 520 kW/m3. This value was comparable to that of Fe76 system powder core with a lower flux density. In addition, fairly superior characteristics of permeability under dc bias field were also attained. The values of Fe81 system core was about 10% higher than that of Fe76 system almost over the entire range measured.

Original languageEnglish
Article number5257198
Pages (from-to)4294-4297
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2009 Oct


  • Amorphous powder core
  • High magnetic flux density
  • Soft-magnetic
  • Water atomization


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