任意衬底上极低吉尔伯特阻尼微米级YIG结构的集成与表征
Integration and characterization of micron-sized YIG structures with very low Gilbert damping on arbitrary substrates
摘要：
我们提出了一种新的工艺，允许转移到几乎任何类型的基板上的单晶钇铁石榴石微结构。该过程是基于最近开发的方法，允许独立的单晶钇铁石榴石桥上的钆镓石榴石的制造。在这里，桥的跨度是从基板上分离的干蚀刻工艺和浸入水溶液。使用滴铸，浸没的YIG片晶可以被转移到所选择的衬底上，在那里结构最终可以被重新附着，从而被集成到复杂的设备或实验几何形状中。使用时间分辨扫描克尔显微镜和电感测量的铁磁共振，我们可以证明，该结构保持其优良的磁性质量。在室温下，我们发现了$μ_0ΔH_{HWHM}\approx 195\,μT$的铁磁共振线宽，我们甚至能够在5 K的温度下感应测量单个微米尺寸的钇铁石榴石片晶上的磁振子谱。该工艺在衬底材料和结构形状方面是灵活的。在未来，这种方法将允许新类型的自旋动力学实验到现在还无法想象。
英文摘要：
We present a novel process that allows the transfer of monocrystalline yttrium-iron-garnet microstructures onto virtually any kind of substrate. The process is based on a recently developed method that allows the fabrication of freestanding monocrystalline YIG bridges on gadolinium-gallium-garnet. Here the bridges' spans are detached from the substrate by a dry etching process and immersed in a watery solution. Using drop casting the immersed YIG platelets can be transferred onto the substrate of choice, where the structures finally can be reattached and thus be integrated into complex devices or experimental geometries. Using time resolved scanning Kerr microscopy and inductively measured ferromagnetic resonance we can demonstrate that the structures retain their excellent magnetic quality. At room temperature we find a ferromagnetic resonance linewidth of $μ_0ΔH_{HWHM}\approx 195\,μT$ and we were even able to inductively measure magnon spectra on a single micron-sized yttrium-iron-garnet platelet at a temperature of 5 K. The process is flexible in terms of substrate material and shape of the structure. In the future this approach will allow for new types of spin dynamics experiments up to now unthinkable.
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