Microwave Magnetic Properties of Nd₂Fe₁₇N_3-δ with Planar Anisotropy

Microwave magnetic properties are studied for rhombohedral structure
NdNd₂Fe₁₇N_3-δ with planar magnetic anisotropy. Its resin composites show the permeability μ₀'=4.15 at low frequency, the natural resonance frequency f_r=1.71GHz and the resonance bandwidth 6.66GHz. The calculated static permeability of Nd₂Fe₁₇N_3-δ reaches 133. The microwave magnetic properties are determined by the c-axis anisotropy field, basal plane anisotropy field and high saturation magnetization. Based on microwave measurement and theoretical fitting on complex permeability spectra, Nd₂Fe₁₇N_3-δ may be a
promising microwave absorber with bandwidth wider than traditional hexaferrites materials in GHz ranges.