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Comparative study of coherent terahertz emission from Fe/Pt ferromagnetic heterostructures

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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.

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DOI:10.3788/COL201917.081601

所属栏目:Materials

基金项目:This work was supported by the National Key R&D Program of China (No.?2017YFA0303403), the National Natural Science Foundation of China (Nos.?11674095, 11874120, 11874015, 51671057, and 11604202), and the Shanghai Rising-Star Program (No.?18QA1401700).

收稿日期:2019-01-26

录用日期:2019-05-13

网络出版日期:2019-07-12

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Xiao-Peng He:State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, China
Pan-Hui Huang:State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, China
Xiao-Yu Yang:State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, China
Zuan-Ming Jin:Department of Physics, Shanghai University, Shanghai 200444, China
Shi-Tao Lou:State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, China
Xiao-Lei Zhang:State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, China
Qing-Yuan Jin:State Key Laboratory of Precision Spectroscopy, School of Physics and Material Science, East China Normal University, Shanghai 200062, ChinaShanghai 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

联系人作者:Shi-Tao Lou(stlou@admin.ecnu.edu.cn); Xiao-Lei Zhang( xlzhang@admin.ecnu.edu.cn);

备注:This work was supported by the National Key R&D Program of China (No.?2017YFA0303403), the National Natural Science Foundation of China (Nos.?11674095, 11874120, 11874015, 51671057, and 11604202), and the Shanghai Rising-Star Program (No.?18QA1401700).

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引用该论文

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," Chinese Optics Letters 17(8), 081601 (2019)

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