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Spin excitations of magnetic thin films are the founding element for noveltransport concepts in spintronics, magnonics, and magnetic devices in general.While spin dynamics have been extensively studied in bulk materials, theirbehaviour in mesoscopic films is less known due to experimental limitations.Here, we employ Resonant Inelastic X-Ray Scattering to investigate the spinexcitation spectrum in mesoscopic Fe films, from bulk-like down to 3 unit cellsthick. In bulk-like samples, we find isotropic, dispersive ferromagnonsconsistent with the dispersion observed by neutron scattering in bulk singlecrystals. As the thickness is reduced, these ferromagnons survive and evolveanisotropically: renormalising to lower energies along the out-of-planedirection while retaining their dispersion in the in-plane direction. Thisthickness dependence is captured by simple Heisenberg model calculationsaccounting for the confinement in the out-of-plane direction through the lossof Fe bonds. Our findings highlight the effects of mesoscopic scaling on spindynamics and identify thickness as a knob for fine-tuning and controllingmagnetic properties in films.

Tuning spin excitations in magnetic films by confinement