论文标题
自旋波聚焦引起的天际生成
Spin-wave focusing induced skyrmion generation
论文作者
论文摘要
我们提出了一种新方法，通过手性铁磁体中的自旋波聚焦生成磁性天空。晶状体的构造是通过两种铁磁薄膜之间的弯曲界面构建的，这些镜头具有不同的垂直磁各向异性。基于相同的镁路径长度的原理，我们得出透镜轮廓，根据镁折射率，可以是椭圆形的或夸张的。进行微磁模拟以验证理论设计。发现在适当的条件下，磁性天空在镜头的聚焦点附近出现，而旋转强度的强度显着增强。密切的调查表明，磁液液滴首先形成，然后随着拓扑电荷的变化而转换为天空。获得了有关Skyrmion生成的刺激场的幅度和持续时间的相图。我们的发现将有助于设计新型的Spintronic设备，结合了Skyrmionics和Magnonics的优势。
We propose a new method to generate magnetic skyrmions through spin-wave focusing in chiral ferromagnets.A lens is constructed to focus spin waves by a curved interface between two ferromagnetic thin films with different perpendicular magnetic anisotropies. Based on the principle of identical magnonic path length, we derive the lens contour that can be either elliptical or hyperbolical depending on the magnon refractive index. Micromagnetic simulations are performed to verify the theoretical design. It is found that under proper condition magnetic skyrmions emerge near the focus point of the lens where the spin-wave intensity has been significantly enhanced. A close investigation shows that a magnetic droplet first forms and then converts to the skyrmion accompanying with a change of topological charge. Phase diagram about the amplitude and duration-time of the exciting field for skyrmion generation is obtained. Our findings would be helpful for designing novel spintronic devices combining the advantages of skyrmionics and magnonics.
