SF series absorbing powder is a special treatment, the magnetic permeability of the real part of the μ' and imaginary part of the μ" to achieve the optimal setting of the two-dimensional soft magnetic powder, the powder breaks through the Snoek limit, with high saturated magnetic induction strength, high permeability and low loss and other characteristics. The reasonably designed powder will have domain wall resonance and natural resonance at GHz, which is conducive to the absorption of electromagnetic waves.