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

摘要

This paper describes our experimental investigation on a correlation between saturation magnetostriction and damping constant in 50-nm-thick $(hbox{Ni-Fe})_{1-x}hbox{M}_{x}$ ($hbox{M}=hbox{Pt}$ , Au, Pd, and Cr; $0 < x < 0.12$) films. The change in $a$ with $x$ is closely related with that of $lambda_{rm s}$ for every M: when $hbox{M}=hbox{Pt}$ , Au, and Pd, $a$ decreases almost monotonically with increasing $lambda_{s}$, while it increases in $(hbox{Ni-Fe})_{1-x}hbox{Cr}_{x}$ films. These results give clear evidence that $a$ correlates with $lambda_{s}$ in $(hbox{Ni-Fe})_{1-x}hbox{M}_{x}$ 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.