INVESTIGATION ON MAGENTIC ANISOTROPY OF IRON SUB LATTICE IN RARE EARTH IRON INTERMETALLIC COMPOUNDS

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The magnetism of iron sub lattice in R_2Fe_<17> was studied with selecting non magnetic yttrium (Y) as R.where R=rare earth elements, and substitution of non magnetic elements for iron. Silicon (Si). Aluminium (Al) and Gallium (Ga) can substitute for iron in wide range. It was found that they do not substitute for iron random but they substitute specific site preferentially. The head investigator found that the preferential site occupation closely related to the properties of the Curie temperature of the compounds.The head investigator tried to substitute Zinc (Zn). Germaninu (Ge). Indium (In). Tin (Sn) and Thallium (Tl) for Fe. It was found that they can not substitute for iron in the compounds. However, the head investigator found that Zirconium (Zr) and Hafnium (Hf) can substitute for Y.The substitution changes the lattice parameters. This discovery can separates the lattice dimension effect and the preferential site occupation effect on magnetism.The easy magnetization direction of Y_2Fe_<17> is on c-plane, which is not agree for application, does not change to c-axis by the substitution. However it was found that the substitution of Si. Al and Ga for Fe reduce the unsuitable anisotropy.