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Intermetallic compounds R2Fe17 are perspective for applications as permanentmagnets. Technologically these systems must have Curie temperature Tc muchhigher than room temperature and preferably have easy axis anisotropy. At themoment highest Tc among stoichiometric R2Fe17 materials is 476 K, which is nothigh enough. There are two possibilities to increase Tc: substitution of Feions with non-magnetic elements or introduction of light elements intointerstitial positions. In this work we have focused our attention onsubstitution scenario of Curie temperature rising observed experimentally inGd(2)Fe(17-x)Ga(x) (x=0,3,6) compounds. In the framework of the LSDA approachelectronic structure and magnetic properties of the compounds were calculated.Ab initio exchange interaction parameters within the Fe sublattice for allnearest Fe ions were obtained. Employing the theoretical values of exchangeparameters Curie temperatures Tc of Gd(2)Fe(17-x)Ga(x) within mean-field theorywere estimated. Obtained values of Tc agree well with experiment. Also LSDAcomputed values of total magnetic moment coincide with experimental ones.

Ab Initio Exchange Interactions and Magnetic Properties of Intermetallic Compound Gd(2)Fe(17-x)Ga(x)