부산대학교 도서관

This article describes the effect of Si composition ( $x$ ) on static and dynamic magnetic properties of 30 nm-thick FexSi100-x polycrystalline films ( $9.7\le x \le21.7$ ). In the experiments, in-plane and out-of-plane effective damping constant ( $\alpha _{\mathrm {//}}$ , $\alpha _{\bot }$ ) were investigated by broadband ferromagnetic resonance (B-FMR). The difference between $\alpha _{\mathrm {//}}$ and $\alpha _{\bot }$ in Fe–Si films indicated that the damping constant was attributed to extrinsic damping for $\alpha _{\mathrm {//}}$ . Moreover, a simple relation between the saturation magnetostriction ( $\lambda _{\mathrm {s}}$ ) and the in-plane effective damping can be obtained for Fe–Si films. In the range of $\lambda _{\mathrm {s}}$ less than (2.59 ± 0.05) $\times 10^{-5}$ , $\alpha _{\mathrm {//}}$ slightly increased as $x$ was decreased. Meanwhile, for $\lambda _{\mathrm {s}}$ more than (2.59 ± 0.05) $\times 10^{-5}_{,}\,\,\alpha _{\mathrm {//}}$ significantly increased as $x$ was increased except $x$ = $15.7. \alpha _{\mathrm {//}}$ reached a minimum as $\lambda _{\mathrm {s}}$ was (2.59 ± 0.05) $\times 10^{-5}$ for $x$ = 13.7. These results demonstrate that the different behavior exhibited by $\alpha _{\mathrm {//}}$ depends on $\lambda _{\mathrm {s}}$ .