Two-peak feature of the permittivity spectra of ferromagnetic microwire/rubber composites

F. X. Qin*, Y. Quere, C. Brosseau, H. Wang, J. S. Liu, J. F. Sun, H. X. Peng

*Corresponding author for this work

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

14 Citations (Scopus)

Abstract

The effective permittivity of CoFeSiB microwire/rubber composites is investigated in the microwave range of frequencies. As the frequency is varied between 0.3 and 6 GHz with or without magnetic field excitation, we identify a two-peak structure of the permittivity spectra. This spectral feature may be attributed to a core-shell structure of the microwires. That is, a core amorphous phase which is surrounded by a small amount of crystalline nanoshell. High-resolution transmission electron microscopy provides a direct means to detect the crystalline nanoshell. Electromagnetic simulations show that Drude-Lorentz's model of dispersion can describe the effective permittivity quite well in this range of frequencies. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798832]

Original languageEnglish
Article number122903
Number of pages4
JournalApplied Physics Letters
Volume102
Issue number12
DOIs
Publication statusPublished - 25 Mar 2013

Keywords

  • SPECTROSCOPY
  • GIANT MAGNETO-IMPEDANCE
  • WIRES
  • AMORPHOUS MICROWIRES

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