Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO_{3}.
Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO_{3}.
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DOI：
10.1103/physrevlett.123.157202
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发表时间：
2019-10
影响因子：
8.6
通讯作者：
E. Mashkovich;K. Grishunin;R. Mikhaylovskiy;A. K. Zvezdin;R. Pisarev;M. Strugatsky;P. Christianen;T. Rasing;A. Kimel
中科院分区：
文献类型：
--
作者：
E. Mashkovich;K. Grishunin;R. Mikhaylovskiy;A. K. Zvezdin;R. Pisarev;M. Strugatsky;P. Christianen;T. Rasing;A. Kimel
一个峰值电场和峰值磁场分别为0.5 MV/cm和0.16 T的近单周期强太赫兹（THz）脉冲，在弱反铁磁体febo_{3}中激发了两种自旋共振模式。高频准反铁磁模式以共振方式激发，其幅值与太赫兹磁场强度成线性关系；低频准铁磁模式以非线性机制激发，其幅值与太赫兹电场强度成二次关系，可视为太赫兹逆棉-木顿效应。太赫兹光磁性被证明比以前报道的近红外光谱范围的类似效应更节能。
A nearly single cycle intense terahertz (THz) pulse with peak electric and magnetic fields of 0.5 MV/cm and 0.16 T, respectively, excites both modes of spin resonances in the weak antiferromagnet FeBO_{3}. The high frequency quasiantiferromagnetic mode is excited resonantly and its amplitude scales linearly with the strength of the THz magnetic field, whereas the low frequency quasiferromagnetic mode is excited via a nonlinear mechanism that scales quadratically with the strength of the THz electric field and can be regarded as a THz inverse Cotton-Mouton effect. THz optomagnetism is shown to be more energy efficient than similar effects reported previously for the near-infrared spectral range.