直写3D纳米火山中的自旋波本征模
Spin-wave eigenmodes in direct-write 3D nanovolcanoes
摘要：
由于纳米结构的几何、曲率和拓扑诱导现象，将纳米结构扩展到三维空间已经成为现代磁学、超导和自旋电子学的主要研究方向。在这里，我们介绍了钴铁nanovolcanoes-nanodisks覆盖的纳米环的目的工程的3D架构的nanomagnonics，制造的聚焦电子束诱导沉积。我们使用两个垂直的自旋波共振测量和微磁模拟证明，环环绕火山口港口的最高频率的本征模，而较低频率的本征模集中在火山口内，由于内部磁场的不均匀性。通过改变弹坑直径，我们证明了故意调谐的高频本征模式，而不影响最低频率模式。因此，将2D纳米盘扩展到第三维允许人们通过使用占地面积小30%的3D纳米火山来设计其最低本征频率。所提出的纳米火山可以被视为多模微波谐振器和纳米磁学的3D构建块。
英文摘要：
Extending nanostructures into the third dimension has become a major research avenue in modern magnetism, superconductivity and spintronics, because of geometry-, curvature- and topology-induced phenomena. Here, we introduce Co-Fe nanovolcanoes-nanodisks overlaid by nanorings-as purpose-engineered 3D architectures for nanomagnonics, fabricated by focused electron beam induced deposition. We use both perpendicular spin-wave resonance measurements and micromagnetic simulations to demonstrate that the rings encircling the volcano craters harbor the highest-frequency eigenmodes, while the lower-frequency eigenmodes are concentrated within the volcano crater, due to the non-uniformity of the internal magnetic field. By varying the crater diameter, we demonstrate the deliberate tuning of higher-frequency eigenmodes without affecting the lowest-frequency mode. Thereby, the extension of 2D nanodisks into the third dimension allows one to engineer their lowest eigenfrequency by using 3D nanovolcanoes with 30% smaller footprints. The presented nanovolcanoes can be viewed as multi-mode microwave resonators and 3D building blocks for nanomagnonics.
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