This paper describes the effect of Ga composition (x) on the static and dynamic magnetic properties of 50-nm-thick Fe100- xGax films (18.5 ≤ x ≤ 33.4). The in-plane damping constant (α//), the perpendicular (out-of-plane) damping constant (α⊥), the saturation magnetostriction (λs) and the maximum piezomagnetic coefficient ((dλ/dH)max) of these films are dependent on x, whereas the tendencies of α// and α⊥ for x are quite opposite to those of λs and (dλ/dH)max for x. For every x, the value of α// is much larger than that of α⊥, suggesting that both the intrinsic damping and the extrinsic damping coexists in the in-plane dynamics of each Fe100- xGax film because of magnetic inhomogeneities such as two magnon scattering, anisotropy dispersion and so on. These results also demonstrate that only the intrinsic damping contributes to the out-of-plane dynamics of each Fe100- xGax film.
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