Abstract
A soft magnetic alloy Tb0.2Dy0.8 (Fe0.8Co0.2)1.93(TDFC) was prepared by combining the arc-melting process and high-energy ball-milling method. The obtained alloys were further modified by polyaniline (PA) via chemical oxidation polymerization method. The magnetic properties, microstructures and microwave-absorption properties of fabricated TDFC/PA composites were investigated in detail. The results show that the reflection loss of TDFC/PA composites reached −38.3 dB at 17.8 GHz with merely 1.6 mm thickness. The effective bandwidth 4.6 GHz (13.24–17.84 GHz) was obtained at 1.9 mm, which almost covered the whole Ku-band (12–18 GHz). The results of impedance matching indicate that the TDFC/PA composites possess good impedance matching due to the suitable complex permeability and complex permittivity, which contribute to excellent microwave absorption. Hence, the TDFC/PA composites have great potential in the microwave-absorption field. This work is significant for the further investigation and application of magnetostrictive magnets.
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