Hierarchical geometric designs for Fe-based amorphous materials with tunable soft magnetic properties

•Porous honeycomb structures of amorphous FeCSi are fabricated with control over the wall width.•Magnetic susceptibility strongly depends on the wall width of porous honeycomb structures.•Susceptibilities of porous honeycomb structures are larger than that of their continuous counterpart.•The geometrical dependence of the magnetic susceptibility is confirmed by phase field modeling.•Underlying mechanism on the dependence of magnetic susceptibility on geometry of porous structure is revealed.