Chinese Optics Letters, 2019, 17 (8): 081601, Published Online: Jul. 12, 2019  

Comparative study of coherent terahertz emission from Fe/Pt ferromagnetic heterostructures Download: 865次

Author Affiliations
1 State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, China
2 Department of Physics, Shanghai University, Shanghai 200444, China
3 Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
Abstract
The ultrafast spin dynamic of in-plane magnetized Fe/Pt films was investigated by terahertz emission spectroscopy. The amplitude of the 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 coincident to the hysteresis loops of the sample. Also, the polarity of the terahertz wave is reversed, as the magnetization orientation is reversed. The super-diffusive transient spin current with an inverse spin Hall effect is attributed to the main mechanism of the terahertz emission.

Xiao-Peng He, Pan-Hui Huang, Xiao-Yu Yang, Zuan-Ming Jin, Shi-Tao Lou, Xiao-Lei Zhang, Qing-Yuan Jin. Comparative study of coherent terahertz emission from Fe/Pt ferromagnetic heterostructures[J]. Chinese Optics Letters, 2019, 17(8): 081601.

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