Abstract
We show that double-resonance spectra recorded during the simultaneous absorption of x-ray and microwave (MW) photons are a fingerprint of the perturbed electronic configuration of atomic species driven to ferromagnetic resonance. X-ray absorption measurements performed as a function of x-ray energy and polarization over the $\text{Fe}\text{ }{L}_{2,3}$ edges of single-crystal yttrium-iron garnet reveal MW-induced multiplet features related to angular momentum transfer from the MW field to localized $\text{Fe}\text{ }3d$ magnetic sublevels. $\text{O}\text{ }K$-edge absorption spectra demonstrate the formation of dynamic $2p$-orbital magnetization components at O sites coupled to the Fe magnetic moments at tetrahedral and octahedral sites. These results are compared with double-resonance x-ray absorption spectra of Permalloy, showing that the MW transition probability is distributed according to the hybridization character of the $3d$ states and proportional to the unperturbed unoccupied magnetic density of states of metals and insulators.
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