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Effect of Doping Elements on the Damping Constant of ({\hbox {Ni-Fe}})_{1-{ x}}{\hbox {M}}_{ x} ( {\hbox {M}}={\hbox {Ga}} , Ag, Mo, and W) Films

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4 Author(s)
Endo, Y. ; Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai, Japan ; Mitsuzuka, Y. ; Shimada, Y. ; Yamaguchi, M.

This paper describes the relationship between the damping constant α and saturation magnetostriction λs of (Ni-Fe)1-xMx (M=Ga, Ag, Mo, and W; 0 <; x ≤ 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 λs, while it is not consistent with that of λs when M = Mo and W. These results suggest that both α and λs 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 λs 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-Fe)1-xMx films are good examples to give evidence that the magnetoelastic energy Eσ has the same intrinsic origin with α.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )