Bulk Fe-based metallic glass with extremely soft ferromagnetic properties

摘要

We have investigated the DC and AC magnetic properties of a bulk glassy Fe{sub}65.5Cr{sub}4Mo{sub}4Ga{sub}4P{sub}12B{sub}5.5C{sub}5 alloy. In the annealed state the alloy has coercivity H{sub}C and maximum DC permeability μm of approximately 0.4 A/m (5 mOe) and 2.8×10{sup}5, comparable to those found in annealed zero-magnetostriction Co-based alloys. The low H{sub}C found in our bulk glassy alloy is attributed to the low ratio of surface-roughness to sample thickness, and low residual internal-stress. The total power loss in our annealed bulk glass is about one order of magnitude lower than that of rapidly quenched Fe-based glassy ribbons. This is attributed to a low anomalous eddy-current loss.