Enhanced Low-Temperature Interfacial Gilbert Damping in Pt/YIG/Pt Trilayer Structures
Enhanced Low-Temperature Interfacial Gilbert Damping in Pt/YIG/Pt Trilayer Structures
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DOI：
10.1109/tmag.2018.2863678
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发表时间：
2019-02
影响因子：
2.1
通讯作者：
S. Pati;Y. Endo
中科院分区：
文献类型：
--
作者：
S. Pati;Y. Endo
采用宽带铁磁共振（FMR）测量方法研究了Pt/YIG/Pt三层结构中随温度变化的磁化动力学。随着温度的降低，共振场向较低的磁场方向移动，从而获得FMR线宽的大幅增加。这导致有效吉尔伯特阻尼（$\alpha _{eff}$）的增强。$\alpha _{eff}$的值在300k时从$1.1 \乘以10^{-3}$增强到$5.0 \乘以10^{-3}$。α _{eff}$值增强的原因可能是界面作用，因为在低温下，钇铁石榴石层的厚度较低。界面磁各向异性色散随温度的降低会导致非均匀展宽增大。
The temperature-dependent magnetization dynamics in Pt/YIG/Pt trilayer structure is investigated by broadband ferromagnetic resonance (FMR) measurement method. The resonance field shifts toward a lower magnetic field with the decrease in temperature, and subsequently, a substantial increase in the FMR linewidth is obtained. This results in the enhancement of effective Gilbert damping ( $\alpha _{eff}$ ). The value of $\alpha _{eff}$ is enhanced from $1.1 \times 10^{-3}$ at 300 K to $5.0 \times 10^{-3}$ at 10 K. The origin of this enhancement in $\alpha _{eff}$ value may be interfacial in nature as it is prominent for the lower thickness of yttrium-iron-garnet layer at low temperature. Magnetic anisotropic dispersion at the interface may lead to the increase in inhomogeneous broadening with decreasing temperature.