Qi Zhang, Ziyan Luo, Hong Li, Yumeng Yang, Xinhai Zhang, and Yihong Wu
https://journals.aps.org/prapplied/accepted/e4071Ye8S501d372930d1321f1d2345f27c025a41
We report on terahertz emission from a single layer ferromagnet which involves the generation of backflow nonthermal charge current from the ferromagnet/dielectric interface by femtosecond laser excitation and subsequent conversion of the charge current to a transverse transient charge current via the anomalous Hall effect, thereby generating the THz radiation. The THz emission can be either enhanced or suppressed, or even the polarity can be reversed, by introducing a magnetization gradient in the thickness direction of the ferromagnet. Unlike spintronic THz emitters reported previously, it does not require additional non-magnetic layer or Rashba interface.
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