Dielectric properties of composites containing melt-extracted co-based microwires

Yang Luo, Faxiang Qin, Jingshun Liu, Huan Wang, Fabrizio Scarpa, Pierre Adohi, Christian Brosseau, Hua-Xin Peng

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)
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We have investigated the microwave properties of epoxy-based composites containing melt-extracted Co69.25Fe4.25B13.5−xSi13Nbx (x=0, 1, 3) microwires of various length annealed using a so-called combined current-modulation annealing (CCMA) technique. The observation of a double-peak feature in the permittivity spectra is believed due to the coexistence of the amorphous phase and a small amount of nanocrystallites on the wires with a high Nb content. CCMA was found to be favorable for a better-defined circular anisotropy of microwires and had suppressed the high-frequency peak due to residual stress relief for the composite with 25 mm long wires. Neither the shift of resonance peak nor the characteristic double peak feature was detected for composites containing as-cast 15 or 35 mm long microwires.
Original languageEnglish
Pages (from-to)20-24
Number of pages5
JournalComposites Communications
Early online date7 Sept 2016
Publication statusPublished - 1 Oct 2016


  • Ferromagnetic microwire-composites
  • Effective permittivity
  • Combined current-modulation annealing (CCMA)
  • Nb doping


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