Correlation Between Saturation Magnetostriction and Damping Constant in $(\hbox{Ni-Fe})_{1-x}\hbox{M}{x}$ ($\hbox{M}=\hbox{Pt}$, Au, Pd, and Cr) Films

This paper describes our experimental investigation on a correlation between saturation magnetostriction and damping constant in 50-nm-thick (Ni-Fe)
_1-
x
M
x
(M=Pt , Au, Pd, and Cr; 0 <;
x
<; 0.12) films. The change in
a
with
x
is closely related with that of λ
_s
for every M: when M=Pt , Au, and Pd,
a
decreases almost monotonically with increasing λ
s
, while it increases in (Ni-Fe)
_1-
x
Cr
x
films. These results give clear evidence that
a
correlates with λ
s
in (Ni-Fe)
_1-
x
M
x
films. These results also reveal that
a
can be controlled effectively by transition metal dopants. In addition, it should be pointed out that when adjusting
a
of magnetically soft films, particular attention must be paid to considerable change of magnetoelastic properties that leads to deterioration of magnetic softness.