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



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.


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.

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