The consequences of non-uniform exchange in magnetic systems are reported. The quantum mechanical exchange interaction between spins is responsible for the phenomenon of magnetic order, and is generally considered to be uniform across bulk magnetic systems. Partly inspired by the Dzyaloshinskii-Moriya interaction—also known as antisymmetric exchange—a linearly varying exchange interaction is used along a magnetic strip as a route to spatial inversion symmetry-breaking. It is found that, in addition to asymmetric modes and localization, spatially varying exchange can be used to design nonreciprocal magnetic signal excitation at frequencies that are tunable. Moreover, the authors’ work predicts nonreciprocity to occur across a vast range of frequencies up to hundreds of GHz. Such spin wave engineering is a key area of ongoing research in the fields of magnonics and spintronics, which are expected to enable the next generation of wireless communication technology and information processing. Analogous nonreciprocity is expected to occur in other wave systems with gradient properties.

中文翻译：

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打破空间反演对称性以获得非均匀磁交换系统中的不对称自旋波激发

报告了磁系统中非均匀交换的后果。自旋之间的量子力学交换相互作用是导致磁序现象的原因，并且通常被认为在整个体磁系统中是均匀的。部分受到 Dzyaloshinskii-Moriya 相互作用（也称为反对称交换）的启发，沿磁条使用线性变化的交换相互作用作为空间反转对称性破坏的途径。研究发现，除了不对称模式和局部化之外，空间变化的交换还可用于设计频率可调的非互易磁信号激励。此外，作者的工作预测在高达数百 GHz 的广泛频率范围内会发生非互易性。这种自旋波工程是磁子学和自旋电子学领域正在进行的研究的一个关键领域，有望实现下一代无线通信技术和信息处理。类似的非互易性预计会出现在其他具有梯度特性的波系统中。