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We have investigated the microwave properties of epoxy-based compositescontaining melt-extracted Co69.25Fe4. 25B13.5-xSi13Nbx (x=0, 1, 3) microwiresof various length annealed using a so-called combined current-modulationannealing (CCMA) technique. The observation of a double-peak feature in thepermittivity spectra is believed due to the coexistence of the amorphous phaseand 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 ofmicrowires and had suppressed the highfrequency peak due to residual stressrelief for the composite with 25 mm long wires. Neither the shift of resonancepeak nor the characteristic double peak feature was detected for compositescontaining as-cast 15 or 35 mm long microwires.

Dielectric Properties of Composites Containing Meltextracted Co-based Microwires