Abstract
Melt spun ribbons of Tb-Fe-Co alloy made with different speeds, viz., 15, 25, 34, and 47 m/s were investigated for structural, microstructural, magnetic, and electrical properties. High cooling rates achieved during melt spinning process were found to significantly affect the microstructure of Tb-Fe-Co ribbons. Structural investigations employing X-ray diffraction and transmission electron microscopy for the Tb-Fe-Co ribbons showed the presence of BCC Fe-Co and amorphous Tb-Fe-Co phases co-existing with the crystalline Tb-Fe-Co phase which has a C15-type cubic Laves structure. In addition, the average grain size of the crystalline Tb-Fe-Co phase is found to decrease with increasing wheel speed during melt spinning. A coercivity value as high as 3.3 kOe was obtained for the melt spun ribbon prepared at 47 m/s wheel speed whereas the as-cast alloy exhibited a coercivity value around 300 Oe. This was attributed to the reduction in the grain size of the crystalline Tb-Fe-Co phase upon melt spinning. Temperature-dependent resistivity measurements indicated that both the as-cast and melt spun ribbons were metallic in nature. The low-temperature resistivity which is dominated by electron-magnon scattering component for the as-cast and melt spun ribbon prepared at 15 m/s was found to show electron-electron scattering as the predominant mechanism with an increase in wheel speed.
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