马格农
自旋电子学
反铁磁性
激发
凝聚态物理
声子
联轴节(管道)
太赫兹辐射
拉曼光谱
旋转泵
自旋(空气动力学)
自旋波
材料科学
物理
铁磁性
光电子学
自旋极化
光学
自旋霍尔效应
量子力学
电子
冶金
热力学
作者
Wei Shi,Yangkai Wang,Hongchuan He,Qiuping Huang,Zhengping Fu,Jianlin Wang,Yalin Lu
摘要
Antiferromagnetic materials have recently been proposed as new types of terahertz (THz) range spintronic devices owing to their ultrafast spin dynamics. Manipulating their spin dynamics expediently, however, remains a key challenge. Here, we demonstrate the laser excitation of magnons in a prototypical antiferromagnet NiO via spin–phonon coupling. The terahertz time-domain spectrum revealed the frequencies of antiferromagnetic magnons near 1 THz. Laser excitations in the visible spectrum caused a noticeable softening of the magnons. Raman spectroscopy results established the presence of optical phonons. The laser heating effect was excluded by finite-element analysis and variable-temperature measurements. The temperature- and power-dependent properties suggest an optical phonon–magnon coupling mechanism. Laser excitation raises the optical phonon temperature, linked with the magnon temperature, via the magnon–phonon interaction. Consequently, the magnon temperature rises, and the magnon mode frequency softens. Our findings shed light on spin–phonon coupling in antiferromagnetic insulators and open a route for creating rapid opto-spintronic devices that utilize antiferromagnetic materials.
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