Park Gyuyoung, Yang Jaehak, Kim Sang-Koog
National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Republic of Korea.
Sci Rep. 2021 Nov 19;11(1):22604. doi: 10.1038/s41598-021-00417-0.
We explored spin-wave multiplets excited in a different type of magnonic crystal composed of ferromagnetic antidot-lattice fractals, by means of micromagnetic simulations with a periodic boundary condition. The modeling of antidot-lattice fractals was designed with a series of self-similar antidot-lattices in an integer Hausdorff dimension. As the iteration level increased, multiple splits of the edge and center modes of quantized spin-waves in the antidot-lattices were excited due to the fractals' inhomogeneous and asymmetric internal magnetic fields. It was found that a recursive development (F = F + G) of geometrical fractals gives rise to the same recursive evolution of spin-wave multiplets.
我们通过具有周期性边界条件的微磁模拟，探索了在由铁磁反点晶格分形组成的不同类型磁振子晶体中激发的自旋波多重态。反点晶格分形的建模是在整数豪斯多夫维数中设计一系列自相似反点晶格。随着迭代水平的增加，由于分形的不均匀和不对称内部磁场，反点晶格中量子化自旋波的边缘和中心模式出现多次分裂。研究发现，几何分形的递归发展（F = F + G）会导致自旋波多重态的相同递归演化。
