Resonant Inelastic X-ray Scattering (RIXS) to Probe Spin Dynamics in Magnonic Materials*

h $-abstract-$\backslash $pardSpin excitations in quantum materials provide a revolutionary alternative for devices with improved performances and energy-efficiency, as they permit the transfer of information without any movement of charge, thus eliminating the dominant source of energy dissipation. Understanding how to manipulate such spin excitations would provide a foundation for the next generation of energy-efficient electronic devices. $\backslash $In this talk, I will present recent results achieved by Resonant Inelastic X-ray Scattering on spin excitations in magnetic thin films of decreasing thickness [1]. Our study demonstrates that confinement is responsible for decreasing the spin excitation energy and increasing their lifetime: we thus propose that the film thickness can be used as a knob to tune the effective refractive for spin excitations in magnetic media used in future magnonic devices.$\backslash $pard1] J. Pelliciari, S. Lee, K. Gilmore, J. Li, Y. Gu, A. Barbour, I. Jarrige, C. H. Ahn, F. J. Walker, V. Bisogni; arXiv: 2010.08745, Accepted in Nature Materials.$\backslash $pard-/abstract-$\backslash $\tex