凝聚态物理
自旋电子学
马格农
克尔效应
磁场
反铁磁性
磁性半导体
磁化
太赫兹辐射
物理
材料科学
光电子学
铁磁性
量子力学
非线性系统
作者
Isaiah Gray,Qinwen Deng,Qi Tian,Michael Chilcote,J. Steven Dodge,Matthew Brahlek,Liang Wu
摘要
α -MnTe is an antiferromagnetic semiconductor with above room temperature TN = 310 K, which is promising for spintronic applications. Recently, it was reported to be an altermagnet, containing bands with momentum-dependent spin splitting; time-resolved experimental probes of MnTe are, therefore, important both for understanding novel magnetic properties and potential device applications. We investigate ultrafast spin dynamics in epitaxial MnTe(001)/InP(111) thin films using pump-probe magneto-optical measurements in the Kerr configuration. At room temperature, we observe an oscillation mode at 55 GHz that does not appear at zero magnetic field. Combining field and polarization dependence, we identify this mode as a magnon, likely originating from inverse stimulated Raman scattering. Magnetic field-dependent oscillations persist up to at least 335 K, which could reflect coupling to known short-range magnetic order in MnTe above TN. Additionally, we observe two optical phonons at 3.6 and 4.2 THz, which broaden and redshift with increasing temperature.
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