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Single- and Multimagnon Dynamics in Antiferromagnetic α−Fe2O3 Thin Films
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Single- and Multimagnon Dynamics in Antiferromagnetic α−Fe2O3 Thin Films
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Journal Article
Single- and Multimagnon Dynamics in Antiferromagnetic α−Fe2O3 Thin Films
2023
Overview
Understanding the spin dynamics in antiferromagnetic (AFM) thin films is fundamental for designing novel devices based on AFM magnon transport. Here, we study the magnon dynamics in thin films of AFMS=52α−Fe2O3by combining resonant inelastic x-ray scattering, Anderson impurity model plus dynamical mean-field theory, and Heisenberg spin model. Below 100 meV, we observe the thickness-independent (down to 15 nm) acoustic single-magnon mode. At higher energies (100–500 meV), an unexpected sequence of equally spaced, optical modes is resolved and ascribed toΔSz=1, 2, 3, 4, and 5 magnetic excitations corresponding to multiple, noninteracting magnons. Our study unveils the energy, character, and momentum dependence of single and multimagnons inα−Fe2O3thin films, with impact on AFM magnon transport and its related phenomena. From a broader perspective, we generalize the use ofL-edge resonant inelastic x-ray scattering as a multispin-excitation probe up toΔSz=2S. Our analysis identifies the spin-orbital mixing in the valence shell as the key element for accessing excitations beyondΔSz=1, and up to, e.g.,ΔSz=5. At the same time, we elucidate the novel origin of the spin excitations beyond theΔSz=2, emphasizing the key role played by the crystal lattice as a reservoir of angular momentum that complements the quanta carried by the absorbed and emitted photons.
