Electromagnetic wave absorption properties of Ni-doped Dy2Co17 alloy.

The Dy₂Co₁₇ compound series has garnered considerable attention due to its high saturation magnetization and Curie temperature, making it a promising candidate for microwave absorption applications. The ideal electromagnetic wave absorbing material should possess exceptional electromagnetic wave attenuation and optimal impedance matching. Doping the material can improve its electromagnetic wave attenuation and impedance matching value, thereby enhancing its electromagnetic wave absorbing ability. In this study, Dy₂Co_17−xNi_x samples were designed to increase their attenuation capability. The addition of Ni elements caused lattice distortion, which modulated the relaxation polarization and resonance loss capability, resulting in the best impedance matching value. The data on attenuation constant, impedance matching value, electromagnetic parameters, magnetism, eddy current loss, and reflection loss of Dy₂Co_17−xNi_x were investigated and analyzed. The results revealed that the samples have a plate-like morphology, and at a frequency of 7.12 GHz and a thickness of 2 mm, the RL_min of Dy₂Co_16.7Ni_0.3 reached − 44.50 dB, indicating good impedance matching. Furthermore, based on CST simulation, the samples demonstrated an effective reduction in the RCS value, highlighting its excellent electromagnetic wave attenuation ability. [ABSTRACT FROM AUTHOR]