High permeability and low loss Ni-Fe composite material for high-frequencyapplications

Yasushi Shirakata, Nobuhiro Hidaka, Masayuki Ishitsuka, Akinobu Teramoto, Tadahiro Ohmi

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


A magnetic material with high permeability and low loss characteristics at high frequency is required for miniaturizing electronic components such as antennas. The key factors to keeping low magnetic loss are a high magnetic resonance frequency and the suppression of the eddy currents. We have fabricated a low-loss magnetic composite material by dispersing Ni78Fe 22 (permalloy) fine flakes in polymers; the thickness of the flakes was less than skin depth. The magnetic loss decreased with increased stirring time, and the minimum value occurred when the agglomerated particles decreased and most of the particles were deformed into flakes. Moreover, Zn5 Ni75 Fe20 composite material indicated high permeability when the flakes were oriented in the direction of sheets. The effect of wavelength shortening by permeability enhancement and the low loss characteristic were confirmed by experimental results of a rod antenna loaded with the developed magnetic composite material.

Original languageEnglish
Article number4604765
Pages (from-to)2100-2106
Number of pages7
JournalIEEE Transactions on Magnetics
Issue number9
Publication statusPublished - 2008 Sep
Externally publishedYes


  • Antennas
  • High frequency
  • Magnetic loss
  • Permalloy
  • Permeability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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