Comparative study of coherent terahertz emission from Fe/Pt ferromagnetic heterostructures
The ultrafast spin dynamic of in-plane magnetized Fe/Pt films was investigated by terahertz emission spectroscopy. The amplitude of emitted terahertz wave is proportional to the intensity of the exciting laser beams. Both the amplitude and polarity of the terahertz wave can be adjusted by modifying the external magnetic field. The dependency of the amplitude on external magnetic fields is coincidence to the hysteresis loops of the sample. Also the polarity of terahertz wave is reversed as the magnetization orientation is reversed. The superdiffusive transient spin current with inverse spin Hall effect (ISHE) is attributed to main mechanism of the terahertz emission.
作者单位：East China Normal University
He Xiaopeng,Huang Panhui,Yang Xiaoyu,Jin Zuanming,Lou shitao,Zhang Xiaolei,Jin Qingyuan. Comparative study of coherent terahertz emission from Fe/Pt ferromagnetic heterostructures[J].Chinese Optics Letters,2019,17(8):08.