材料期刊网

The effect of the substitution of Ni for Fe on the magnetic and structural properties of RFe11.3Nb0.7 compounds (R = Dy and Er) has been studied. All of the compounds studied crystallize in the ThMn12 type of structure and the lattice constants a and c decrease with increasing Ni content. Substitution of Ni for Fe leads to a clear increase of the Curie temperature and to a decrease of the saturation magnetization. The temperature dependencies of the ac susceptibility and the magnetization indicate spin reorientations in all of the compounds. The easy-magnetization direction at room temperature has been determined to be along the c-axis from x-ray diffraction patterns of magnetically aligned samples. The effect of Ni substitution on the magnetocrystalline anisotropy is also discussed.