Excellent soft-ferromagnetic bulk glassy alloys with high saturation magnetization

The development of Fe-based bulk glassy alloys (BGAs) with high glass-forming ability has become a very hot research topic, not only because of the soft-magnetic properties, but also of the high fracture strength. Here we report the discovery of excellent soft-ferromagnetic BGAs in FeMoPCBSi system, without the expensive element Ga, which can be cast into glassy alloy rods with diameters range up to 4 mm by copper mold casting. These low cost Fe-based ferromagnetic BGAs exhibit high saturation magnetization of 1.27-1.44 T and superhigh initial permeability of 13 400-25 000 at 1 kHz under a field of 1 A/m. (c) 2006 American Institute of Physics.