Ferromagnetic Characteristics of Bulk Fe 63 Co 7 Nb 4 Zr 6 B 19 Si 1 Metallic Glass

By copper mold casting, a bulk Fe63Co7Nb4Zr6B19Si1 metallic glass was synthesized in the diameter of 2mm. The Fe-based amorphous alloy exhibits soft ferromagnetic characteristics with a saturation magnetization of 77Am2/kg and a saturated magnetostriction of 25.4×10-6. The saturation magnetization is reduced while the coercive force is slightly lowered by annealing treatment below the crystallization temperature. The devitrification gives rise to a remarkable enhancement both in saturation magnetization and coercive force.