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

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...

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Veröffentlicht in:Applied physics letters 2013-03, Vol.102 (12)
Hauptverfasser: Qin, F. X., Quéré, Y., Brosseau, C., Wang, H., Liu, J. S., Sun, J. F., Peng, H. X.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4798832