Three-dimensional nanoscale imaging of propagating spin waves via time-resolved X-ray Laminography.

Girardi D., Finizio S., Rubini G., Mayr S., Donnelly C., Maspero F., Cuccurullo S., Raabe J., Petti D., Albisetti E.
  Martedì 13/09   09:00 - 13:30   Aula D - Marianna Ciccone   II - Fisica della materia   Presentazione
Spin waves are wave-like perturbations of the magnetization, in which the magnetic moments precess around their axis. Since their travelling is not associated to charge motion, they hold the promise to strongly reduce the power consumption, while having sub-{\mu $m$ wavelengths in the GHz--THz frequency range allows the miniaturization of spin wave-based devices. Their measurement with 3D resolution is a key point for the improvement of the comprehension of spin waves. Until now, however, spin waves have only been studied with 2D time-resolved techniques, and their 3D visualization still represents a major challenge. Here, we exploit the innovative Soft X-Ray Laminography method, present at the PolLux beamline of the Swiss Synchrotron Light Source that allowed to reconstruct for the first time the sequence of 3D time-resolved images of propagating spin-wave modes and to study the variation of their localization in the $z$-direction. This work represents an important step towards the possibility to study and control three-dimensionally the spin waves emission and propagation for the development of innovative 3D nanomagnonic devices for the next-generation computing architectures.