Bulk glassy Fe78-xCoxGa2P12C4B4 alloys with high saturation magnetization and good soft magnetic properties

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.