Superior microwave absorption properties of anisotropic Y 2 Fe 16 _ x Co x Si/ paraffin composites by orientation tuning

Y 2 Fe 16-x Co x Si/paraffin composites were prepared by three different orientation methods. The effect of these orientation methods and the magnetocrystalline anisotropy of Y 2 Fe 16_x Co x Si alloys on the electromagnetic parameters and the microwave absorption properties were investigated. The results demonstrated that orientation tuning improved the electromagnetic parameters and microwave absorption properties. Anisotropy in dielectric properties and magnetic properties of Y 2 Fe 16-x Co x Si/paraffin composites were achieved by tuning the orientation of Y 2 Fe 16-x Co x Si powders. The planar and conical anisotropic materials had superior microwave absorption properties than uniaxial anisotropic materials for the same orientation method. The Y 2 Fe 16_x Co x Si/paraffin composite had an effective absorption bandwidth of 8.4 GHz (9.6 - 18 GHz) and a reflection loss of _59.6 dB which can almost cover the X - Ku bands and exceed the performance of many reported absorbing materials, showing its great prospects for microwave absorption in the X - Ku bands.