蒸着法による FeBi 膜の構造と垂直磁化特性

We have studied dependence of Bi composition on the perpendicular magnetic anisotropy of evaporated thin films from Fe100-xBix evaporant at the film growth site. The films were prepared by a one-point vacuum evaporation method in which Fe and Bi were put in the same place. The evaporated films clearly showed perpendicular magnetization characteristics at x = 1.6 at%. The saturation magnetization: 4πMs, remanent magnetization: 4πMr⊥, and coercive force: Hc⊥, were 20 × 103 (G), 0.6 × 103 (G), and 500 (Oe), respectively. One cause of the increase in the magnetization is thought to be the effect of a perpendicular configuration for Fecolumn grains growth which is constituted just as Bi reevaporates. Namely, formation of regular column grains with excellent orientations had a favorable influence upon the magnetization characteristics. We inquired into the process of the growth of the films by X-ray diffractometer, AES analysis, and SEM photographs and found the optimum production of the film.