Effect of Co on the magnetic properties of YGdFe{sub}17Ga

摘要

The Curie temperatures of the R2Fe17 compounds are low [maximum of 387K for Sm{sub}2Fe{sub}17] due to the small exchange splitting in the 3d bands. In addition, the room temperature anisotropy is predominantly due to the Fe sublattice and is planar. Partial substitution of non-magnetic elements such as Al, Ga and Si for iron, or interstitial modification by N and C, has been reported to cause considerable increase in the T{sub}C and magnetocrystalline anisotropy of these compounds. It has been recently reported that the off-stochiometric 2:17 compounds of the type Sm{sub}2Fe{sub}(17-x)T{sub}xM (T=Co, Ti) formed in rhombohedral Th{sub}2Zn{sub}17 structure and that the enhancement of Curie temperature and saturation magnetization in these compounds with x was more compared to the stoichiometric 2:17 compounds. The investigation of the Fe sublattice anisotropy can best be understood when the anisotropy of the rare earth sublattice is not present. In this paper, the magnetic properties of the off stoichiometric YGdFe{sub}(17-x)Co{sub}xGa compounds are presented.