Active control of spin-wave properties is at the heart of on-chip reconfigurable magnonics, which promise development of energy efficient and miniaturized on-chip processing and communication devices in the GHz and sub-THz frequency range. Here, we demonstrated active control of spin-wave spectra in two-dimensional nanoscale antidot lattices arranged in shifted honeycomb and octagonal symmetries by varying the antidot diameter using broadband ferromagnetic resonance. Both these lattices exhibited stark variation in the spin-wave spectra with antidot diameter, besides the variation of the strength and orientation of bias magnetic field. With increasing diameter number of spin-wave modes gradually increased, and the position of mode splitting shifted to higher magnetic field due to ensuing increase in the demagnetizing field governing the spin-wave extension or localization in the lattices. The bias-field angle variation revealed higher-order rotational symmetry characteristic of quasi-periodic structure. Micromagnetic simulations qualitatively reproduced the experimental observations, and simulated spin-wave mode profiles revealed extended and standing spin-wave modes and their mutual conversion with bias-field angle in both lattices. The contrasting variation in the amplitude of rotational symmetry of spin-wave frequency with antidot diameter was interpreted by the variation of spin-wave mode profiles as well as the simulated internal magnetic field variation. Such efficient tunability of spin-wave properties with internal structure and external control parameters and higher-order rotational anisotropy in these atypical magnonic crystals will promote them for applications in on-chip reconfigurable magnonic devices.

自旋波特性的主动控制是片上可重构磁振子的核心，它有望在 GHz 和亚太赫兹频率范围内开发节能和小型化的片上处理和通信设备。在这里，我们展示了通过使用宽带改变反点直径来主动控制以移位蜂窝和八边形对称排列的二维纳米级反点晶格中的自旋波光谱。铁磁共振。除了偏置磁场的强度和方向的变化外，这两种晶格在自旋波谱中都表现出明显的反点直径变化。随着直径的增加，自旋波模式的数量逐渐增加，由于控制自旋波在晶格中的扩展或局部化的退磁场的增加，模式分裂的位置转移到更高的磁场。偏置场角的变化揭示了准周期结构的高阶旋转对称特性。微磁模拟定性地再现了实验观察，模拟的自旋波模式剖面揭示了扩展和驻留的自旋波模式以及它们在两个晶格中与偏置场角的相互转换。自旋波频率的旋转对称幅度与反点直径的对比变化是通过自旋波模式轮廓的变化以及模拟的内部磁场变化来解释的。这种具有内部结构和外部控制参数的自旋波特性的有效可调性以及这些非典型磁子晶体中的高阶旋转各向异性将促进它们在片上可重构磁子器件中的应用。