Magnetic-field-free terahertz emission from a magnetic tunneling junction

Authors

Jugeng Li, Shanghai University
Zuanming Jin, Shanghai University, STU & SIOM Joint Laboratory for Superintense Lasers and the Applications
Bangju Song, Shanghai University
Shunnong Zhang, Shanghai University
Chenyang Guo, University of Chinese Academy of Sciences
Caihua Wan, University of Chinese Academy of Sciences
Xiufeng Han, University of Chinese Academy of Sciences
Zhenxiang Cheng, University of WollongongFollow
C Zhang, University of WollongongFollow
Xian Lin, Shanghai University
Guohong Ma, Shanghai University, STU & SIOM Joint Laboratory for Superintense Lasers and the ApplicationsFollow
Jianquan Yao, Tianjin University

RIS ID

139177

Publication Details

Li, J., Jin, Z., Song, B., Zhang, S., Guo, C., Wan, C., Han, X., Cheng, Z., Zhang, C., Lin, X., Ma, G. & Yao, J. (2019). Magnetic-field-free terahertz emission from a magnetic tunneling junction. Japanese Journal of Applied Physics, 58 (9), 090913-1-090913-5.

Abstract

Recently, ferromagnetic (FM) heterostructures have been demonstrated to emit THz radiation induced by femtosecond laser pulses. In such spintronic THz emitters, an in-plane external magnetic field is technological required to assist the orientations of the magnetization, which could be an obstacle for practical micro-electrooptic applications. Here, as a proof-of-concept, THz generation is based on the inverse spin Hall effect of the FM/Ta within a magnetic tunneling junction (MTJ) without external magnetic field. Furthermore, THz emission can be engineered by modulating of the tunneling conductivity within a photoexcited MTJ as the relative magnetizations of two FM layers change their alignments.