Qiu Jin, Nguyen Thi Huyen, Kim Seung, Lee Young Jin, Song Meng-Ting, Huang Wen-Juan, Chen Xiang-Bai, Nguyen Thi Minh Hien, Yang In-Sang
Department of Physics, Ewha Womans University, Seodaemun-gu, Seoul, 03760, Korea.
Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Donghu New & High Technology Development Zone, Wuhan, 430205, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Nov 5;280:121498. doi: 10.1016/j.saa.2022.121498. Epub 2022 Jun 13.
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.
我们报告了在100至300 K温度范围内对NiO纳米颗粒拉曼光谱的二维相关光谱（2D - COS）分析。二维拉曼相关光谱表明，声子光谱强度变化与NiO纳米颗粒中的磁有序存在强相关性。结果表明，反铁磁有序影响了NiO纳米颗粒中的TO声子各向异性。通过进行适当的二维相关光谱模型模拟，我们阐明了双磁振子（2M）带的复杂光谱特征。我们的结果支持了NiO纳米颗粒中显著的自旋 - 声子耦合。还发现高能磁振子 - 磁振子相互作用尾也参与了自旋 - 声子耦合。二维相关光谱分析提供了有关NiO纳米颗粒声子和磁振子激发性质的丰富信息。
