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Magnonics is gaining momentum as an emerging technology for informationprocessing. The wave character and Joule heating-free propagation of spin-waveshold promises for highly efficient analog computing platforms, based onintegrated magnonic circuits. Miniaturization is a key issue but, so far, onlyfew examples of manipulation of spin-waves in nanostructures have beendemonstrated, due to the difficulty of tailoring the nanoscopic magneticproperties with conventional fabrication techniques. In this Letter, wedemonstrate an unprecedented degree of control in the manipulation ofspin-waves at the nanoscale by using patterned reconfigurable spin-textures. Byspace and time-resolved scanning transmission X-ray microscopy imaging, weprovide direct evidence for the channeling and steering of propagatingspin-waves in arbitrarily shaped nanomagnonic waveguides based on patterneddomain walls, with no need for external magnetic fields or currents.Furthermore, we demonstrate a prototypic nanomagnonic circuit based on twoconverging waveguides, allowing for the tunable spatial superposition andinteraction of confined spin-waves modes.

Nanomagnonic waveguides based on reconfigurable spin-textures for spin computing