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Nd 2 Fe 14 B ∕ α - Fe nanocomposites were prepared using a melt-spinning method, subsequent annealing treatment, and ball milling. The complex permittivity and permeability of the composites were measured in the 0.5–18 and 26.5–40GHz frequency ranges. The permeability spectra of the Nd2Fe14B∕α-Fe nanocomposites exhibit relaxation and resonance type characteristic in the 0.5–18 and 26.5–40GHz frequency ranges, respectively. The resonance frequency (fr) of Nd10Fe78Co5Zr1B6 nanocomposite is 30GHz due to the large anisotropy field (HA). However, the resonance frequency of the Nd2Fe14B∕α-Fe sample is lower than that of Nd2Fe14B, due to the decrease of HA induced by the exchange interaction between hard and soft magnetic phases. These samples also showed good microwave absorption performance (reflection loss: <−20dB) in 9, 17, and 35–38GHz with matching thicknesses of 2, 1.2, and 0.37mm, respectively. Therefore, Nd2Fe14B∕α-Fe nanocomposites are thought to be a potential candidate for thinner microwave absorbers not only in the centimeter wave but also in the millimeter wave band.
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Lian et al. (2007) studied this question.
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