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_(65.5)Cr_4Mo_Ga_4P_(12)B_(5.5)C_5 alloy. In the annealed state the alloy has coercivity H_C and maximum DC permeability μ_m of approximately 0.4 A/m (5 mOe) and 2.8x10~5, comparable to those found in annealed zero-magnetostriction Co-based alloys. The low H_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.