Effects of iron substitution on magnetic properties of SmCo_6.8 xFe_xHf_0.2compounds

Abstract

The effects of iron substitution on the crystal structure and magnetic properties of SmCo6.8−xFexHf0.2 (x = 0.1, 0.3, 0.5, and 0.7) compounds were investigated by means of x-ray powder diffraction and magnetic measurements. The as-cast SmCo6.8−xFexHf0.2 compounds crystallize in the TbCu7-type structure with the space group P6/mmm. The lattice parameters a and c increase with the Fe content. The SmCo6.8−xFexHf0.2 compounds exhibit ferromagnetic order with a strong room temperature uniaxial magnetocrystalline anisotropy. The Curie temperature and saturation magnetization increase with the Fe content. The magnetic anisotropy field of the compounds reaches a maximum value at x = 0.5. The anomalous concentration dependence of the anisotropy field is explained by considering the contribution of individual site anisotropy in combination with the preferential occupation of 3d ions on different sites.

Effect of Fe content on structural and magnetic properties of SmCo 4 − x Fe x B alloys

“…While the substitution of Co by the metalloid element B lowers the overall magnetization of SmCo 4 B, additional substitution of Co by Fe is expected to increase the magnetization which has been observed in both YCo 4 B [19] and SmCo 7 systems [20]. In addition, energy product, being an extrinsic parameter, is strongly affected by microstructure.…”