YIG和YIG { \textbar }Pt的单个纳米盘中的固有阻尼常数的测量
Measurement of the intrinsic damping constant in individual nanodisks of YIG and YIG{\textbar}Pt
摘要：
我们报道了两个系列的直径为$ϕ=$ 300，500和700 nm的纳米盘的自旋波弛豫率的实验研究，图案化出两个系统：一个20 nm厚的钇铁石榴石（YIG）薄膜通过脉冲激光沉积生长裸或覆盖13 nm的Pt。使用磁共振力显微镜，我们精确地测量每个单独的YIG和YIG{ \textbar }Pt纳米盘的铁磁共振线宽。我们发现，在纳米结构的线宽是明智的小于在扩展膜中测量的。的光谱线宽的频率依赖性的分析表明，改善主要是由于抑制的不均匀的部分，由于几何限制的扩大，这表明只有均匀的扩大有助于纳米结构的线宽。对于裸YIG纳米盘，加宽与阻尼常数$α= 4 \cdot 10^{-4}$相关联。一个3倍的线宽增加观察与Pt帽层的系列，归因于自旋泵效应。所测量的增强允许提取自旋混合电导，发现对于我们的YIG（20 nm）{ \textbar }Pt界面是$G_{\uparrow \downarrow}= 1.55 \cdot 10^{14}~ Ω^{-1}\text{m}^{-2}$，从而为具有优化磁损耗的基于YIG的纳米结构的设计打开了很大的机会。
英文摘要：
We report on an experimental study on the spin-waves relaxation rate in two series of nanodisks of diameter $ϕ=$300, 500 and 700~nm, patterned out of two systems: a 20~nm thick yttrium iron garnet (YIG) film grown by pulsed laser deposition either bare or covered by 13~nm of Pt. Using a magnetic resonance force microscope, we measure precisely the ferromagnetic resonance linewidth of each individual YIG and YIG{\textbar}Pt nanodisks. We find that the linewidth in the nanostructure is sensibly smaller than the one measured in the extended film. Analysis of the frequency dependence of the spectral linewidth indicates that the improvement is principally due to the suppression of the inhomogeneous part of the broadening due to geometrical confinement, suggesting that only the homogeneous broadening contributes to the linewidth of the nanostructure. For the bare YIG nano-disks, the broadening is associated to a damping constant $α= 4 \cdot 10^{-4}$. A 3 fold increase of the linewidth is observed for the series with Pt cap layer, attributed to the spin pumping effect. The measured enhancement allows to extract the spin mixing conductance found to be $G_{\uparrow \downarrow}= 1.55 \cdot 10^{14}~ Ω^{-1}\text{m}^{-2}$ for our YIG(20nm){\textbar}Pt interface, thus opening large opportunities for the design of YIG based nanostructures with optimized magnetic losses.
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