Soft magnetic composite containing magnetic flakes with in-plane uniaxial magnetic anisotropy

A novel soft magnetic composite (SMC) containing magnetic flakes with in-plane uniaxial magnetic anisotropy was successfully fabricated. The magnetic flakes of amorphous FeCoBSi phase were compacted in an insulating matrix to fabricate the SMC. The fabricated SMC was annealed under a magnetic field, and in-plane uniaxial magnetic anisotropy was observed in the flattened planes of the magnetic flakes after annealing. The coercivity of the SMC in the easy axis direction was approximately half of that in the hard axis direction after annealing. The minimum coercivity in the easy axis direction was 0.1 Oe, and much smaller than those of conventional SMCs, SMC developed in the other work, and electrical steel sheet. An extremely small core loss of 16 kW/m(3) can be expected at 1 T and 400 Hz, reflecting the small coercivity value (0.1 Oe).