FeSiBP metallic glasses with high glass-forming ability and excellent magnetic properties

Novel Fe-rich Fe-based bulk glassy alloys with unusual combination of high saturation magnetization (J(s)) and high glass-forming ability (GFA) have been developed. The representative Fe76Si9B10P5 (atomic percent) alloy exhibits with high J(s) of 1.51 T, comparable to the Fe-Si-B amorphous alloy ribbons with thickness of about 25 mu m in now practical use, because of without any glass-forming metal element other than Fe, which significantly decreases J(s), as well as high GFA leading to a rod-shaped specimen of 2.5 mm in diameter. This bulk glassy alloy also shows extremely low coercivity of 0.8 A/m at a glassy state with a higher degree of atomic density of dense random packed structure by optimum annealing. Therefore, the alloy composed of familiar elements with the excellent properties and low material cost should have a great advantage for engineering and industry, and also make a contribution to conservation of environment and earth resources. (C) 2007 Elsevier B.V. All rights reserved.