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[22a-P5-2] Magneto-anisotropy of epitaxial SmFe7 and SmFe7Nx films
Keywords:epitaxial film,SmFe alloy,Magneto-anisotropy
SmFeN system is a promising material for permanent magnets which could replace the present Nd2Fe14B magnet since it has a higher Curie temperature and similar magnetic properties without the involvement of heavy rare-earth elements. Epitaxial SmFe7 films were fabricated on a Ta buffered Al2O3 (0001) substrate by the magnetron sputtering method. SmFe7 films were nitrogenized by irradiation with nitrogen atoms, resulting in SmFe7Nx=1.3 films. The torque curves reveal that an axis of easy magnetization changes toward parallel to the (0001) plane from perpendicular after nitrogenation which is in contradiction to the case of Sm2Fe17.