论文标题
分级指数限制了中间域壁中的自旋波
Graded Index Confined Spin Waves in an Intermediate Domain Wall
论文作者
论文摘要
我们提出了一个数学模型，用于描述域之间中间角度域中的域壁中传播限制模式。所提出的模型是从线性化的BLOCH运动方程式得出的，在合理的假设之后，在足够厚的磁贴的情况下，被计算出来。该模型表明，在壁的局部角度和所使用的激发频率上，局部波数的局部波数明显依赖，这导致了壁中局部折射索引的定义，这是该角度和频率的函数。因此，该模型适用于1D传播模式，尽管它对域壁与饱和磁区域合并的2D场景也具有物理意义。微磁模拟与模型的预测非常吻合，还可以深入了解弯曲有限结构对域壁中自旋波的传播特性的影响。
We propose a mathematical model for describing propagating confined modes in domain walls of intermediate angle between domains. The proposed model is derived from the linearised Bloch equations of motion and after reasonable assumptions, in the scenario of a thick enough magnetic patch, are accounted. The model shows that there is a clear dependence of the local wavenumber of the confined spin wave on the local angle of the wall and excitation frequency used, which leads to the definition of a local index of refraction in the wall as a function of such angle and frequency. Therefore, the model applies to 1-D propagating modes, although it also has physical implications for 2-D scenarios where a domain wall merges with a saturated magnetic region. Micromagnetic simulations are in good agreement with the predictions of the model and also give insight on the effects of curved finite structures may have on the propagating characteristics of spin waves in domain walls.
