2019 年 3 巻 1 号 p. 34-38
This paper reports the effect of Ga composition on the static and dynamic magnetic properties of 10-nm-thick Fe-Ga polycrystalline films. As for the static magnetic properties of these films, the saturation magnetization (4πMs) decreased as the Ga composition increased. This feature is similar to that of Fe-Ga bulk alloy. The saturation magnetostriction (λs) also increased as the Ga composition increased, but these values were lower than those of Fe-Ga bulk alloy. As for their dynamic magnetic properties, the damping constant (α) decreased from 0.034 to 0.012 as the Ga composition increased, suggesting that the magnetization of Fe-Ga films with Ga compositions below 25 at.% switched slowly in the high frequency range. Therefore, the effect of Ga composition on α and λs is opposite between the two, indicating that this feature differs from those in Ni-Fe and Fe-Si binary alloy films.
