Two-dimensional correlation spectroscopy analysis of Raman spectra of NiO nanoparticles

Jin Qiu, Thi Huyen Nguyen, Seung Kim, Young Jin Lee, Meng Ting Song, Wen Juan Huang, Xiang Bai Chen, Thi Minh Hien Nguyen, In Sang Yang

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Abstract

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.

Original languageEnglish
Article number121498
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume280
DOIs
StatePublished - 5 Nov 2022

Keywords

  • NiO nanoparticles
  • Phonon anisotropy
  • Raman spectra
  • Spin-phonon coupling
  • Two-dimensional correlation spectroscopy

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