Evaluation of three-dimensional electromagnetic properties of a soft magnetic composite containing amorphous Fe–Co–B–Si magnetic flakes with magnetic anisotropy

We investigated electromagnetic properties in a previously developed soft magnetic composite (SMC) containing amorphous Fe-Co-B-Si magnetic flakes with magnetic anisotropy. Magnetic permeability, core loss, and electrical resistivity in three axial directions were measured. These measurements revealed that magnetic permeability differed between the three axial directions, whereas core loss was larger in the direction perpendicular to the flattened plane of the interior flakes than in the other two directions, although it was still expected to be acceptable for applications due to the relatively high electrical resistivity. This paper is the first direct evidence that such an SMC would have three-dimensional magnetic anisotropy and low core loss.