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20 August 2020 Terahertz emission from anomalous Hall effect in single-layer and synthetic antiferromagnetic structures
Qi Zhang, Ziyan Luo, Yumeng Yang, Hong Li, Yanjun Xu, Rongxiang Nie, Xinhai Zhang, Yihong Wu
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Proceedings Volume 11470, Spintronics XIII; 1147025 (2020) https://doi.org/10.1117/12.2569540
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
We report on terahertz (THz) 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 (AHE), 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. The emission can also be enhanced using a synthetic antiferromagnet (SAF) via the same AHE mechanism. In addition, we demonstrate by both simulation and experiment that the THz emission provides a powerful tool to probe the magnetization reversal process of individual ferromagnetic layers in the SAF structure – an important building block for all types of spintronic devices.
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Qi Zhang, Ziyan Luo, Yumeng Yang, Hong Li, Yanjun Xu, Rongxiang Nie, Xinhai Zhang, and Yihong Wu "Terahertz emission from anomalous Hall effect in single-layer and synthetic antiferromagnetic structures", Proc. SPIE 11470, Spintronics XIII, 1147025 (20 August 2020); https://doi.org/10.1117/12.2569540
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KEYWORDS
Terahertz radiation
Magnetism
Spintronics
Femtosecond phenomena
Ferromagnetics
Polarization
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