Anomalous Nernst Effect Induced Terahertz Emission in a Single Ferromagnetic Film
Zheng Feng, Wei Tan, Zuanming Jin, Yijia Chen, Zhangfeng Zhong, Liang Zhang, Song Sun, Jin Tang, Yexing Jiang, Po-Hsun Wu, Jun Cheng, B. F. Miao, Haifeng Ding, Dacheng Wang, Yiming Zhu, Liang Guo, Sunmi Shin, Guohong Ma, Dazhi Hou, S. Y. Huang
Abstract
Despite its important role in understanding ultrafast spin dynamics and revealing novel spin/orbit effects, the mechanism of the terahertz (THz) emission from a single ferromagnetic nanofilm upon a femtosecond laser pump still remains elusive. Recent experiments have shown exotic symmetry, which is not expected from the routinely adopted mechanism of ultrafast demagnetization. Here, by developing a bidirectional pump-THz emission spectroscopy and associated symmetry analysis method, we set a benchmark for the experimental distinction of the THz emission induced by various mechanisms. Our results unambiguously unveil a new mechanism─anomalous Nernst effect (ANE) induced THz emission due to the ultrafast temperature gradient created by a femtosecond laser. Quantitative analysis shows that the THz emission exhibits interesting thickness dependence where different mechanisms dominate at different thickness ranges. Our work not only clarifies the origin of the ferromagnetic-based THz emission but also offers a fertile platform for investigating the ultrafast optomagnetism and THz spintronics.