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Spin excitations in atomic-scale nanostructures have been investigated withinelastic scanning tunneling spectroscopy, sometimes with conflicting results.In this work we present a theoretical viewpoint on a recent experimentalcontroversy regarding the spin excitations of Co adatoms on Pt(111). While onegroup [Balashov et al., Phys. Rev. Lett. \textbf{102}, 257203 (2009)] claims tohave detected them, another group reported their observation only after thehydrogenation of the Co adatom [Dubout et al., Phys. Rev. Lett. \textbf{114},106807 (2015)]. Utilizing time-dependent density functional theory incombination with many-body perturbation theory we demonstrate that, althoughinelastic spin excitations are possible for Cr, Mn, Fe, and Co adatoms, theirefficiency differs. While the excitation signature is less pronounced for Mnand Co adatoms, it is larger for Cr and Fe adatoms. We find that the tunnelingmatrix elements related to the nature and symmetry of the relevant electronicstates are more favorable for triggering the spin excitations in Fe than in Co.An enhancement of the tunneling and of the inelastic spectra is possible byattaching hydrogen to the adatom at the appropriate position.

Spin excitations in 3d transition-metal adatoms on Pt(111): Observable with inelastic scanning tunneling spectroscopy or not?