Identifying the two-dimensional (2D) topological insulating (TI) state in new materials and its control are crucial aspects towards the development of voltage-controlled spintronic devices with low-power dissipation.

The effective redirection of spin waves and their local control are among the main challenges faced by the emergent field of magnon spintronics. To solve the problem Lara et al. introduce a breakthrough technology for communication and signal processing using spin waves localized at the edges of magnetic nanostructures.