Surface Texturing and Enhanced Microwave Absorption of Fe-B Alloy Flakes Through a Dealloying Process

Aiming at enhancing the shape anisotropy of a microwave absorber and elongating the travel distance of microwave along the absorber surface for better absorption, we fabricated the textured nanoflaky powders of Fe–B alloy through the two-step ball milling method followed by dealloying. The complex permittivity and permeability of as-dealloyed powders were characterized systematically. The results showed that the flaky powders of Fe–B with textured structure possess enhanced microwave absorption properties: an optimal reflection loss ( $R_{L} = -45.8$ dB) at 9.2 GHz with a matching thickness of 2.4 mm.