The glass-forming ability, thermal stability and magnetic properties have been investigated for a Fe
67Co
9.5Nd
3Dy
0.5B
20 glassy alloy with a large supercooled liquid region of 48 K prepared by the melt-spinning technique. The glassy phase is formed in the wide sheet thickness range from 20 to 250 \\micron. The glass transition temperature (
Tg), crystallization temperature (
Tx), supercooled liquid region (
ΔTx=
Tx−
Tg) and heat of crystallization (
ΔHc) remain almost unchanged in the thickness range below 250 \\micron, and then the
ΔHc gradually decreases with further increasing sheet thickness. The crystallized nanocomposite structure consists of Fe
3B, α-Fe, Nd
2Fe
14B and remaining glassy phase, and their average grain sizes are about 25 nm annealed at 903 K for 420 s. The remanence (
Br), coercivity (
iHc), and maximum energy product (
BH)
max are 1.26 T, 235 kA/m, and 104 kJ/m
3, respectively, for the sheet of 250 \\micron in thickness annealed at 903 K for 420 s. The hard magnetic properties remain almost unchanged in the thickness range below 250 \\micron, and decrease gradually in the sheets with thicknesses above 250 \\micron.
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