Department of Physics, National University of Singapore, Singapore, 117542, Singapore.
Nanoscale Res Lett. 2012 Sep 4;7(1):498. doi: 10.1186/1556-276X-7-498.
The magnonic band structures for exchange spin waves propagating in one-dimensional magnonic crystal waveguides of different material combinations are investigated using micromagnetic simulations. The waveguides are periodic arrays of alternating nanostripes of different ferromagnetic materials. Our results show that the widths and center frequencies of the bandgaps are controllable by the component materials, the stripe widths, and the orientation of the applied magnetic field. One salient feature of the bandgap frequency plot against stripe width is that there are n-1 zero-width gaps for the nth bandgap for both transversely and longitudinally magnetized waveguides. Additionally, the largest bandgap widths are primarily dependent on the exchange constant contrast between the component materials of the nanostructured waveguides.
利用微磁学模拟方法研究了不同材料组合的一维磁性晶体波导中传播的交换自旋波的磁振子能带结构。波导是由不同铁磁材料的交替纳米条带组成的周期性阵列。我们的结果表明，带隙的宽度和中心频率可以通过组成材料、条带宽度和外加磁场的方向来控制。带隙频率与条带宽度关系图的一个显著特点是，对于横向和纵向磁化波导，第 n 个带隙有 n-1 个零宽度间隙。此外，最大带隙宽度主要取决于纳米结构波导组成材料之间的交换常数对比度。
