物理学进展2023，Vol.43Issue(5)：142-150,9.DOI:10.13725/j.cnki.pip.2023.05.002
Cr2O3中反铁磁自旋波的低频拉曼光谱研究
Low-Frequency Raman Detection of Antiferromagnetic Spin Waves in Cr2O3
摘要
Abstract
The antiferromagnetic(AFM)spin waves are promising for being utilized in high-speed and energy-efficient information processing.However,the excitation and detection of terahertz spin waves in AFM systems is challenging.Here,we demonstrate low-frequency Raman spectroscopy as a powerful tool for spin-wave detection in AFM systems.We present a systematic study of AFM magnons in Cr2O3,a prototypical uniaxial antiferromagnet,via Raman measurements down to 2.3 cm-1(69 GHz).We resolved the magnon Zeeman splitting and the spin-flop transition.We further determined the sign of angular momentum of the magnon branches via polarization-resolved Raman processes.We also obtained the anisotropy energy,the g-factor,and the spin-flop field of Cr2O3 as a function of temperatures and magnetic fields.A spin-wave renormalization theory accounts for all experimental observations.关键词
反铁磁性/自旋波/低频拉曼光谱/自旋翻转Key words
antiferromagnetism/spin wave/low-frequency Raman spectroscopy/spin-flop分类
物理学引用本文复制引用
董彪,崔骏,田远哲,吴镝,张琦..Cr2O3中反铁磁自旋波的低频拉曼光谱研究[J].物理学进展,2023,43(5):142-150,9.基金项目
We thank Dr.Song Bao and Prof.Jin-sheng Wen for their help in the measurement of magnetic susceptibility.This work is supported by the National Key Research,Development Program of China(2020YFA0309200)and National Natural Sci-ence Foundation of China(52025012). （2020YFA0309200）
