[22a-P5-1~18] 6.4 Thin films and New materials

[22a-P5-2] Magneto-anisotropy of epitaxial SmFe₇ and SmFe₇N_x films

〇Takeshi Kusumori¹, Asaya Fujita¹, Kimihiro Ozaki¹ (1.AIST)

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 SmFe₇N_x=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.