表面调制磁振子晶体中退磁场的作用
The role of the internal demagnetizing field in a surface-modulated magnonic crystal
摘要：
具有局部交替性质和特定周期性的磁振子晶体表现出有趣的效应，例如多种不同的自旋波态和大的带隙。这项工作的目的是证明和理解在这样的系统中的局部退磁场的关键作用。为了实现这一点，混合结构的研究，包括一个连续的薄膜与条纹调制的顶部有利的，由于调制大小的磁振子效应的可调性。为了直接获得自旋动力学，从“自下而上”重建了磁振子晶体，即，使用电子全息术在纳米尺度上实验获得结构形状以及结构的内部场景观。随后，这两个属性被用来执行动态响应计算。模拟产生的频率场的依赖性，以及自旋波在磁振子晶体的角度依赖性，并揭示了周围的后向体积几何形状的内部场景观的支配作用。复杂的角度依赖的自旋波的行为被描述为一个360度的面内旋转的外部场通过连接的内部场景观与个人的自旋波本地化。
英文摘要：
Magnonic crystals with locally alternating properties and specific periodicities exhibit interesting effects, such as a multitude of different spin-wave states and large band gaps. This work aims for demonstrating and understanding the key role of local demagnetizing fields in such systems. To achieve this, hybrid structures are investigated consisting of a continuous thin film with a stripe modulation on top favorable due to the adjustability of the magnonic effects with the modulation size. For a direct access to the spin dynamics, a magnonic crystal was reconstructed from `bottom-up', i.e., the structural shape as well as the internal field landscape of the structure were experimentally obtained on the nanoscale using electron holography. Subsequently, both properties were utilized to perform dynamic response calculations. The simulations yield the frequency-field dependence as well as the angular dependence of spin waves in a magnonic crystal and reveal the governing role of the internal field landscape around the backward-volume geometry. The complex angle-dependent spin-wave behavior is described for a 360 degree in-plane rotation of an external field by connecting the internal field landscape with the individual spin-wave localization.
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