This paper describes the relationship between the damping constant α and saturation magnetostriction λ s of (Ni-Fe1-xM x (M=Ga, Ag, Mo, and W; 0\,<!xleq \,0.10) films to clarify the effect of doping elements on α and other magnetic properties in these films. For M=Ga and Ag, the change of α with x is closely related with that of λ s, while it is not consistent with that of λ s when M= Mo and W. These results suggest that both α and λ s are correlated with each other as the single fcc Ni-Fe phase remains unchanged with x for M=Ag and Ga, while that α and λ s are independent from each other because of coexistence of fcc Ni-Fe and new phases when M=Mo and W. Therefore, it is pointed out that α can be controlled effectively by selecting the doping elements which do not induce a new phase in the Ni-Fe binary alloy, but one should be careful about a change in magnetoelastic properties which may deteriorate magnetic softness. These results for M=Ga and Ag also suggests that (Ni-Fe1-xM x films are good examples to give evidence that the magnetoelastic energy E \sigma has the same intrinsic origin with α.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering