Formation and magnetic properties of Fe–Si–B–Dy amorphous alloy

Multi-component alloy ribbons with compositions of (Fe0.75Si0.10B0.15)100−xDyx (X = 0, 0.5, 1 and 2 at.%) are prepared by single roller melt-spinning method. The structure is fully amorphous as demonstrated by XRD investigation. When Dy addition is above 1 at.%, the glass transition temperature (Tg) appears in DSC curves and has a large supercooled liquid range (ΔTx) up to 51 K. The amorphous alloy ribbons exhibit good soft magnetic properties with Curie temperature (TC) between 700 K and 653 K, high saturation magnetization (MS) between 1.58 and 1.50 T, and coercive force (HC) of 27.77–22.28 A/m. In this study, it is shown that as little as 2 at.% of Dy addition to Fe–Si–B alloys is very effective in improving glass-forming ability and still maintains good soft magnetic properties.