Two-dimensional correlation spectroscopy analysis of Raman spectra of NiO nanoparticles
- 주제(키워드) NiO nanoparticles , Phonon anisotropy , Raman spectra , Spin-phonon coupling , Two-dimensional correlation spectroscopy
- 등재 SCIE, SCOPUS
- 발행기관 Elsevier B.V.
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000193244
- 본문언어 영어
- Published As https://doi.org/10.1016/j.saa.2022.121498
- PubMed https://pubmed.ncbi.nlm.nih.gov/35724591
초록/요약
We report two-dimensional correlation spectroscopy (2D-COS) analyses of the Raman spectra of NiO nanoparticles over a temperature range from 100 to 300 K. 2D-Raman correlation spectra suggest strong correlation of the phonon spectral intensity variation with the magnetic ordering in NiO nanoparticles. It is revealed that the antiferromagnetic ordering affects the TO phonon anisotropy in NiO nanoparticles. We elucidate the complex spectral features of two-magnon (2 M) bands by performing appropriate 2D-COS model simulations. Significant spin-phonon coupling in NiO nanoparticles is supported by our results. High energy magnon-magnon interaction tails are also found to be involved in the spin-phonon coupling. 2D-COS analyses provide rich information regarding the nature of the phonon and magnon excitations of NiO nanoparticles. © 2022
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