Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films
Applied Physics Letters2019Vol. 115(14)
Citations Over TimeTop 13% of 2019 papers
Lin Huang, Ji-Wan Kim, Sang-Hyuk Lee, Seon-Dae Kim, T. V. Manh, K. P. Shinde, Je‐Ho Shim, Yooleemi Shin, Hee Jun Shin, Seongheun Kim, Jaehun Park, Seung‐Young Park, Yeon Suk Choi, Hyun‐Joong Kim, Jung‐Il Hong, Dong Eon Kim, Dong‐Hyun Kim
Abstract
We have experimentally investigated the field- and fluence-dependent terahertz (THz) emission behaviors by a femtosecond optical pump in Co ferromagnetic films, together with the time-resolved magneto-optical Kerr effect measurement. The thickness of Co and Ta capping layers has been systematically varied. For thick films, THz emission behavior is found to be directly matched with the photoinduced ultrafast demagnetization and remagnetization dynamics. The angle-dependent THz emission measurement also confirms a direct relation between the THz emission and the photoinduced demagnetization/remagnetization dynamics in the case of thick films, while THz emission from the inverse spin Hall effect also plays a role in the case of thin Co films.
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