Single- and Multimagnon Dynamics in Antiferromagnetic α − Fe 2 O 3 Thin Films

Li, Jiemin; Gu, Yanhong; Takahashi, Yoshihiro; Higashi, Keisuke; Kim, Taehun; Cheng, Yang; Yang, Fengyuan; Kuneš, Jan; Pelliciari, Jonathan; Hariki, Atsushi; Bisogni, Valentina

doi:10.1103/PhysRevX.13.011012

Title: Single- and Multimagnon Dynamics in Antiferromagnetic $α − {Fe}_{2} O_{3}$ Thin Films

Journal Article · Wed Feb 01 00:00:00 EST 2023 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.13.011012· OSTI ID:1922987

; Gu, Yanhong; Takahashi, Yoshihiro; Higashi, Keisuke;

; Cheng, Yang; Yang, Fengyuan;

;

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 AFM S=$$\frac{5}{2}$$α – Fe₂O₃ by 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 to ΔS_z=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 in α–Fe₂O₃ thin films, with impact on AFM magnon transport and its related phenomena. From a broader perspective, we generalize the use of L-edge resonant inelastic x-ray scattering as a multispin-excitation probe up to ΔS_z=2S. Our analysis identifies the spin-orbital mixing in the valence shell as the key element for accessing excitations beyond ΔS_z=1, and up to, e.g., ΔS_z=5. At the same time, we elucidate the novel origin of the spin excitations beyond the ΔS_z=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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0001304; SC0012704; 21K13884; 21H01003

OSTI ID:: 1922987

Alternate ID(s):: OSTI ID: 1974382

Report Number(s):: BNL-224395-2023-JAAM; PRXHAE; 011012

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 13 Journal Issue: 1; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Single- and Multimagnon Dynamics in Antiferromagnetic α − Fe 2 O 3 Thin Films

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Title: Single- and Multimagnon Dynamics in Antiferromagnetic $α − {Fe}_{2} O_{3}$ Thin Films