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

Qin, F. X.; Quéré, Y.; Brosseau, C.; Wang, H.; Liu, J. S.; Sun, J. F.; Peng, H. X.
March 2013
Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p122903
Academic Journal
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.


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