反铁磁自旋波在高速和低能耗信息处理方面具有很大潜力。然而，在反铁磁体系中激发和 检测太赫兹自旋波是具有挑战性的。在本工作中，我们验证了低频拉曼光谱可作为探测反铁磁体 系中自旋波的有力工具。我们通过拉曼光谱系统研究了典型的单轴反铁磁体 Cr₂O₃ 中的反铁磁自 旋波，我们的测量范围低至 2.3 cm⁻¹（69 GHz）。我们分析了自旋波的塞曼劈裂和自旋翻转相变。 我们进一步通过偏振拉曼的方式确定了自旋波能支的角动量符号。我们还得到了 Cr₂O₃ 的各向异 性能，g 因子和自旋翻转场随温度和磁场变化的函数关系。自旋波重整化理论解释了所有实验观 测结果。

The antiferromagnetic (AFM) spin waves are promising for being utilized in highspeed 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.