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Qiu, Jin; Nguyen, Thi Huyen; Lee, Young Jin; Kim, Seung; Kim, Sujin; Kim, Sung-Jin; Song, Meng-Ting; Huang, Wen-Juan; Chen, Xiang-Bai; Yang, In-Sang
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 09/2023, Volume: 297Journal Article
Display omitted •A strong Raman intensity enhancement of the two-magnon (2 M) mode was observed in the NiO nanoparticles annealed in vacuum.•The increased 2 M peak intensity is microscopically explained by the increasing proportion of octahedral NiO6 symmetry.•Varied oxygen environment underlie both the change in the 2 M intensity and the splitting of TO phonon of NiO nanoparticles. Nanostructured antiferromagnetic (AFM) NiO has attracted much attention from both the fundamental and applied perspectives. Understanding the two-magnon (2 M) is of great significance in NiO applications such as spin valves and next-generation magnetic random access memories (MRAM). We investigated the phonon modes and antiferromagnetically ordered states of NiO nanoparticles prepared by empirically controlled measurements. An intensity enhancement of the 2 M mode was observed by Raman spectroscopy as the NiO nanoparticles were vacuum annealed at 650 ℃. The increased 2 M peak intensity in NiO nanoparticles is explained by the local symmetry conversions from NiO5 to NiO6 configurations due to the oxygen redistribution during the vacuum annealing. The change of the splitting of anisotropic transverse optical (TO) phonon with different oxygen contents was also revealed by the Raman spectroscopy. We have shown that the changes in the oxygen environment underlie both the change in the 2 M intensity and the splitting of TO phonon in the NiO nanoparticles. Our work offers an efficient avenue to strengthen the AFM ordering and emphasizes the effect of vacuum annealing of the NiO nanoparticles, opening the interesting possibility of individual parameter control in practical applications.
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