Emission and propagation of 1D and 2D spin waves with nanoscale wavelengths in anisotropic spin textures

Spin waves offer intriguing novel perspectives for computing, such as means for high-speed transmission and processing of data at extremely low energy dissipation rates, with the potential to out-perform conventional, charge transport-based circuits. In order to control the spatial extend and propagation of spin waves on the actual chip, magnetic domain walls have been investigated as potential magnonic wave-guides - with promising results. However, low-loss guidance of spin waves, in particular around angled tracks, remains to be shown. Here we experimentally demonstrate that such advanced control can be obtained in a system of anisotropic, interlayer exchange-coupled ferromagnetic bilayers. Using Scanning Transmission X-Ray Microscopy, we image spin-wave creation and propagation across distances multiple times the wave-length, in extended planar geometries as well as along one-dimensional domain walls, which can be straight and curved. These results show routes towards the practical implementation of domain walls as magnonic waveguides in future spin-logic circuits.