Optimisation of microwave absorption properties of Fe-substituted Y2Co17−xFex soft-magnetic composites

2021 
The increase in electromagnetic wave pollution at high frequency (gigahertz band) has led to an increasing demand for more effective microwave absorption materials (MAMs). This study aims to investigate magneto-crystalline anisotropy materials as MAMs. Magnetic and microwave absorption properties of Y2Co17−xFex (x = 0, 5, 9, 13, 17) are reported in this study. As the Fe content increases, the magneto-crystalline anisotropy of Y2Co17−xFex changes from planar anisotropy to axis, then to cone, and eventually to plane. Meanwhile, the variation trend of the magnetization (Ms) value increases first and then decreases, reaching a maximum at x = 9. The Y2Co17−xFex/paraffin composites (x = 0, 13, 17) with the planar anisotropy show stronger reflection loss (RL) than that composite (x = 5) with the uniaxial anisotropy. The strongest RL value is achieved for the conical anisotropy composites (x = 9). This composite, with conical anisotropy and highest Ms, exhibits the highest gigahertz frequency permeability, which is advantageous for improving the impedance matching and attenuation abilities of microwave absorption. The Y2Co8Fe9/paraffin composite exhibits a reflection loss value of − 46.9 dB and effective absorption bandwidth (EAB, RL < − 10 dB) of 4.74 GHz with a thickness of 2.0 mm at 10.2 GHz, suggesting its applicability as an efficient microwave absorbent in the gigahertz frequency.
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