Perpendicular magnetic anisotropy can be induced when the atoms orbital anisotropy in the ultrathin ferromagnetic layer is reflected. Here, we computationally study a ferromagnetic skyrmion-based nano-oscillator model with a composite structure, where the skyrmion dynamics is controlled by modifying perpendicular magnetic anisotropy. The proposed nano-oscillator structure has two concentric circular areas with different anisotropy coefficients. When the anisotropy of the inner area is larger than that of the outer area, the inner area can provide a repulsive force acting on the skyrmion, leading to the motion of skyrmion along with the edge of the inner circular area. Three cases of skyrmion motion are found for different anisotropy coefficients. We also study the effects of each anisotropy coefficients and current density on the frequency of the skyrmion-based nano-oscillator. Our results provide a promising method to modulate the frequency of future skyrmion-based nano-oscillators.

当反射超薄铁磁层中的原子轨道各向异性时，可以诱发垂直磁各向异性。在这里，我们通过计算研究了一种具有复合结构的基于铁磁Skyrmion的纳米振荡器模型，其中通过修改垂直磁各向异性来控制Skyrmion动力学。所提出的纳米振荡器结构具有两个具有不同各向异性系数的同心圆形区域。当内部区域的各向异性大于外部区域的各向异性时，内部区域可以提供作用在天蝎子上的排斥力，导致天蝎子与内部圆形区域的边缘一起运动。发现了三种具有不同各向异性系数的天体运动的情况。我们还研究了每个各向异性系数和电流密度对基于Skyrmion的纳米振荡器频率的影响。我们的结果提供了一种有前途的方法来调制未来基于Skyrmion的纳米振荡器的频率。