Magnonics addresses the dynamic excitations of a magnetically ordered material. These excitations, referred to as spin waves and their quanta, magnons, are a powerful tool for information transport and processing on the microscale and nanoscale. The physics of spin waves is very rich, ranging from a coexistence between dipole–dipole interaction and symmetric and antisymmetric exchange interaction, to various types of interface effects, anisotropies and spin torques. Spin waves are easily driven into the nonlinear regime. They can be confined and guided, and they can be amplified. Spin waves may be generated with varying degrees of coherency, depending on the excitation method, and transport mechanisms range from diffusive to ballistic. In this Review, we address specifically coherent spin waves. Coherency enables, for instance, the design of interference-based, wave processing spin-wave devices. Thus, the field of magnonics is well suited for the implementation of wave-based computing devices, combining the excellent versatility, smallness, nonlinearity and external control it affords. Novel coherent states of matter, such as magnon Bose–Einstein condensates, enable a broad range of additional applications.

Magnonics 解决了磁性有序材料的动态激发。这些激发，称为自旋波及其量子，磁振子，是在微米尺度和纳米尺度上进行信息传输和处理的强大工具。自旋波的物理学非常丰富，从偶极-偶极相互作用和对称和反对称交换相互作用之间的共存，到各种类型的界面效应、各向异性和自旋扭矩。自旋波很容易进入非线性状态。它们可以被限制和引导，也可以被放大。自旋波可以产生不同程度的相干性，这取决于激发方法，并且传输机制的范围从扩散到弹道。在这篇评论中，我们专门讨论相干自旋波。例如，一致性使 基于干涉的波处理自旋波装置的设计。因此，磁学领域非常适合基于波的计算设备的实现，结合了它提供的出色的多功能性、小尺寸、非线性和外部控制。新的相干物质状态，例如磁子玻色-爱因斯坦凝聚态，可以实现广泛的附加应用。