Bl. Shen et al., Bulk glassy Fe78-xCoxGa2P12C4B4 alloys with high saturation magnetization and good soft magnetic properties, MATER TRANS, 42(6), 2001, pp. 1052-1055
The effect of Co on the magnetic properties and glass-forming ability for t
he Fe78-xCOxGa2P12C4B4 glassy alloys was investigated. The addition of 4 to
8 at%Co was found to be effective for the extension of the supercooled liq
uid region (DeltaT(x)) defined by the difference between the glass transiti
on temperature (T-g) and crystallization temperature (T-x). The dr, value i
s 26 K for the Fe78Ga2P12C4B4 alloy and increases to 37 K for the 4 at%Co a
lloy. Besides, the addition of a small amount of Co was also found to be ef
fective for increasing the saturation magnetization (I-s) and decreasing th
e coercive force (H-c). These glassy ribbon alloys exhibit good soft magnet
ic properties of 1.36 to 1.43 T for saturation magnetization and 1.5 to 1.8
A/m for coercive force. The largest saturation magnetization (I-s) is 1.43
T for Fe74Co4Ga2P12C4B4 alloy. Based on its large DeltaT(x), we tried to p
repare bulk glassy Fe74Co4Ga2P12C4B4 rods in a cylindrical form with differ
ent diameters. The glassy single phase was obtained in the diameter of 0.5
and 1.0 mm. These bulk glassy alloys also exhibit high saturation magnetiza
tion of about 1.42T.