手征系统中受限模的反常性质
The Unusual Nature of Confined Modes in a Chiral System
摘要：
自旋波传播的非互易性是一个众所周知的结果，反对称交换的贡献可能在磁性自旋系统，缺乏反演对称。在这种情况下，状态的能量可能取决于其动量的符号为ω（k）${\neq}$ ω（-k）。我们在这里讨论的后果，这种非互易性对反向传播的自旋波状态。在一个封闭的几何形状，我们发现状态与定义明确的节点，但与调制，使反转对称的模式分布的振幅丢失。这一特征导致了这样的建议，即在例如具有磁共振的铁磁微元件的铁磁共振研究中，附加特征可能变得可见，从而允许量化磁共振的幅度和方向。此外，这种非互易模式之间的干扰形成了模式限制的广义概念的基础。
英文摘要：
Nonreciprocity of spin wave propagation is a well-known consequence of antisymmetric exchange contributions possible in magnetic spin systems that lack inversion symmetry. In this case, it is possible for the energy of a state to depend on the sign of its momentum as ω(k) ${\neq}$ ω(-k). We discuss here the consequences of this nonreciprocity on counterpropagating travelling spin wave states. In a confined geometry we find states with well-defined nodes but with amplitudes that are modulated such that inversion symmetry of the mode profile is lost. This feature leads to the suggestion that additional features may become visible in, for example, ferromagnetic resonance studies of ferromagnetic micro-elements with DMI, allowing a quantification of the amplitude and direction of the DMI. Moreover, this interference between nonreciprocal modes forms the basis for a generalized concept of mode confinement.
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