Magnetic properties and glass formability of Fe61Co10Zr5W4B20 bulk metallic glassy alloy

Amorphous melt spun ribbon samples of ${\mathrm{Fe}}_{61}{\mathrm{Co}}_{10}{\mathrm{Zr}}_5{\mathrm{W}}_4{\mathrm{B}}_{20}$ alloy of various thicknesses up to ∼350 μm and suction cast 1 mm diameter rod and 2, 3, and 4 mm outside diameter tube samples of the same alloy were produced. The experimental results for the rod samples indicate a relatively high saturation polarization ${\mu }_0{M}_s\text{=0.8\hspace{0.17em}}\mathrm{T}$ and a Curie temperature $T_C\text{=615\hspace{0.17em}}\mathrm{K},$ as well as a very low coercive field $H_c\text{=1.4±0.5\hspace{0.17em}}\mathrm{A/m}$ with high anisotropy that lowers the permeability of the samples. Thermal analysis by differential scanning calorimetry carried out on ribbon and rod samples revealed a large supercooled liquid region ${\mathrm{\Delta T}}_x$ of ∼60 K for this alloy.