Abstract
Magnetic properties and crystal structure of melt spun SmCo 7-x M x ( M = Hf , V , Nb , and Ta ; x = 0–0.3) ribbons have been investigated. The experimental results showed that not just Hf but also V , Nb and Ta prefer to occupy 2e site in the TbCu 7 structure and remarkably increase coercivity of the ribbons from 1.7 kOe for x = 0 to 10–12 kOe for x = 0.2, which would be due to the increase of magnetic anisotropy field by the element substitution. Furthermore, the effect of C addition on the magnetic properties and microstructure of melt spun Sm ( Co , M )7 ribbons were also studied. A small amount of C addition in the ribbons could effectively refine their microstructure, and leads to further improvement of the magnetic properties. The optimal magnetic properties of B r = 6.9 kG , i H c = 11.8 kOe and ( BH ) max = 10.6 MGOe were attained for SmCo 6.8 Hf 0.2 C 0.12 nanocomposites.
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