Effect of 3d transition metal substitution on microstructure and microwave absorption properties of FeSiB nanocrystalline flakes

Abstract Effect of 3d transition metal substitution (Co and Ni) is studied on microstructure and absorption properties of FeSiB flakes in GHz. Fe78−xMxSi9B13 (M=Co or Ni, x=0, 5, 10 and 15) nanocrystalline flakes with nanocrystal/amorphous two-phase structure were prepared by ball milling. Substitution decreases the nanocrystal size and affects microwave behavior both compositionally and structurally according to the substitution mechanism. Compositional influence is contributing to the change of intrinsic magnetization parameters; structural influence works on exchange coupling. Absorption band of Fe78Si9B13 flakes shifts towards lower frequency by the substitution, and Fe63Co15Si9B13 absorber shows promising absorption at C-band.